Ok. To start, check engine light, and check gas cap light has been on for awhile. Changed cap multiple times. Also, SOMETIMES at start, my car needs a little gas or it sometimes stalls. Usually if I turn the key and let the fuel pump full turn on it's fine.

But I got this:

P0455 - Evap Emission Control System Leak (Large)

P1258 - Manufacturer Control Fuel Air Metering


Could you give me the possibilities of what these 2 things could be?

I got the money now to fix everything so, I would like to get everything together and running good.

Thanks..

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Eeyup,you've got a big vacuum leak in the EVAP system.

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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!

Vacuum leak? So just a simple line then?

Is the the Emission code or the Fuel Air code?

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The purge for the EVAP system feeds into the inlet after the MAF.
One code tells me you have improper fuel metering - I'm guessing MAF related.
The other says large control system leak.

I would start looking at the connection for the EVAP system at the intake end and look backwards from there.

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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!

Alright. Thanks a lot!

When I went to Advanced to use their scanner, one of the guys their said that the P1258 code may be MAF related also so, hopefully that's it. New MAF sensor $85. Not too bad. lol

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I was thinking that a vacuum leak *AFTER* the MAF was causing errant readings.
The leak sounds like it's in the evap system.
Sorry if I wasn't clear.

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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!

Well the leak yes. But the other code with the Fuel Air problem I was thinking maybe the MAF sensor itself but, i guess I'll just have to check it out

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