Last night I was on the highway, started to speed up to pass some other cars when the SES started flashing and the car was sputtering and loosing power.

I've recently changed the plugs, had stock Delcos, never been replaced by the looks of it. I had NGK Platinums installed by a mechanic. When he installed them i started to get misfires like crazy and threw a Cylinder 5 misfire code. They checked it and found that the wire was grounding out on the heat shield.

The car (06 N/A) has been running fine up until last night. Not sure what could be causing it. 2 weeks ago I changed the PCV valve and cleaned the MAF. I am going to take a look at everything tomorrow but I don't have a scanner so i won't be able to see if there are any codes.

Anyone have an suggestions or tips on what to look for while I'm checking everything. The plugs are approx 3k old or so (done in early July). I was planning to clean the TB and check the plugs and wires. Could it be a bad or failing ICM, where is it located? Is it a hard job to swap out?

TIA

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Factory in-dash NAV / K&N Filter / 6500K HID Lows / LED Everything / Gutted stock air box
Flipped Motor Mounts / Brisk Plugs / Shimmy's Custom 4-core wires / Aeroforce Interceptor

What did you use to clean the MAF?

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1998 GTP (L32 swap) | 2000 SE (L67 swapped)

Why buy something sensible with a RWD setup when you can build something really stupid, like this

CRC MAF cleaner. I disconnected it, sprayed it out, let it dry for about 30 min and then reassembled it. It's been running fine for the past 2 weeks.

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Factory in-dash NAV / K&N Filter / 6500K HID Lows / LED Everything / Gutted stock air box
Flipped Motor Mounts / Brisk Plugs / Shimmy's Custom 4-core wires / Aeroforce Interceptor

I recently went through this and it turned out when the mechanic put the plug wire back on the plug,he misaligned the clip in the boot with the sparkplug tip and pushed it up into the boot.
The sparkplug wire then arced to the shield when I power washed the engine.
No way it should have done that after only one year.
I pulled the wire off and to put new silicone dielectric grease in the boot and that's when I saw it.
I pushed the wire and clip back down into the boot,greased it and reinstalled it.
It clipped on nicely where it hadn't before.
All is well now.
If you can't feel the "grip" of the clip on the tip of the plug,chances are it's loose.

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2005 GT owner [Non S/C] with a "big DIC".
Two years later and I still love the car.
Thanks Pontiac...Bleen is keen!

My GT responded exactly like yours (flashing SES light and losing power when revved) when it had a clogged cat.

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2003 Lincoln LS V8 Premium Sport
RIP: 2002 Redfire Metallic Grand Prix GT Coupe
One man's treasure became another man's trash.

Yeah...I can believe that.

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One Big Ass Mistake America

Flashing SES in this case = Multiple Random Misfire DTC P0300

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Self made, not daddy paid.

I think it was a random misfire. I went and checked the spark plug wires, the #5 seems a little loose. I also took the time to clean the TB while I was there and it was crusted black. When I finished i forgot to reconnect the TB cable and started the motor. Now there is a solid check engine light, I called OnStar and had them run a diagnostic probe. It came back with an intake and TB code. I reconnected everything but the code remains. I'll have to get the scanner or get a scan done to clear the code.

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Factory in-dash NAV / K&N Filter / 6500K HID Lows / LED Everything / Gutted stock air box
Flipped Motor Mounts / Brisk Plugs / Shimmy's Custom 4-core wires / Aeroforce Interceptor

The code will go away on its own after a while without seeing Multiple Random Misfires for a certain amount of time. It will turn the SES light off, but will remain in the history.

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Self made, not daddy paid.

If I get an Aeroforce will I be able to see the codes stored in the history or do I need a stand alone scanner for that?

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Factory in-dash NAV / K&N Filter / 6500K HID Lows / LED Everything / Gutted stock air box
Flipped Motor Mounts / Brisk Plugs / Shimmy's Custom 4-core wires / Aeroforce Interceptor

That I do not know...lol I know it shows DTC in real time but I'm not sure about history...

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Self made, not daddy paid.

It's all fixed now. Took the car to a friend, he checked everything and saw that the wires were completely dead. He installed new 4-core wires, Brisk plugs and gutted my stock air box for me. He also flipped my motor mounts. Car is running 100% better now.

Thanks for the help

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Factory in-dash NAV / K&N Filter / 6500K HID Lows / LED Everything / Gutted stock air box
Flipped Motor Mounts / Brisk Plugs / Shimmy's Custom 4-core wires / Aeroforce Interceptor

Glad I could help

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Self made, not daddy paid.