i have a 1997 grand prix gt that i have do a gtp motor and trans swap and i am haveing trouble with the car want to break up real bad the harder you get on the throttle it acts like it is spark knocking i replaced the coils, plugs, wires and it still has not gottin any better i need to know what would cause it to do that if anyone can help.

Get a DHP Powertuner or an HP Tuner, and you will find your problem.

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2004 Comp G
Stock for now....

What kind of spark plugs did you put in and what did you gap them at? Also, what pulley size are you running?

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

I am running al 103's at.050 gap and i am running a stock pulley.

Did you change the PCM when you changed the motor?

If your fuel/air tables are wrong or have problems, that sort of thing will happen. I had that sort of issue when I was tuning my car. This was before Eddie's tuning thingy when you had to make table changes in excel. My MAF table did not have smooth enough transitions between values. So the jumps in those ranges caused all sorts of problems such as breaking up and the transmission not shifting to the next gear until I let off the throttle. I ran a curve chart on the table and saw the jerkiness at certain values. Once I had a smooth curve, all the problems went away.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

103's are too cold of a plug for a stock pulley.

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ALL GO, LITTLE SHOW

• 2004 Comp G - Modded Like A Mofo And Hibernating

• 1988 VW Jetta - Slammed Slow And Reliable

• 1994 Cadillac Eldorado ETC - Sold

What plugs do i need to run and i had intense build a pcm for a 1997 gtp.

What is your complete mod list? Autolite 605's may be appropriate, but you may be best off with stock plugs.

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One Big Ass Mistake America

i have full headers 3inch down pipe a cai throttle body spacer and full 2 1/2 inch exhaust and a pcm.

Get a 180* thermostat and auto lite 104 plugs and you should be good. Like it was said before, gap them at about .055 and hopefully that should solve your breaking up problem.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

^ x eleventy

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ALL GO, LITTLE SHOW

• 2004 Comp G - Modded Like A Mofo And Hibernating

• 1988 VW Jetta - Slammed Slow And Reliable

• 1994 Cadillac Eldorado ETC - Sold

Actually, scratch my last. I forgot that you were running a stock pulley. Still get the 180* t-stat and get autolite 605's. That is 1 heat range colder than stock. If you decide to drop pulleys then go with the 104's which are 2 heat ranges colder than stock.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

lol scratch mine too i thought you said 605's lmao. FAIL

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ALL GO, LITTLE SHOW

• 2004 Comp G - Modded Like A Mofo And Hibernating

• 1988 VW Jetta - Slammed Slow And Reliable

• 1994 Cadillac Eldorado ETC - Sold

I corrected myself, FAILBOAT avoided. LOL

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

haha

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ALL GO, LITTLE SHOW

• 2004 Comp G - Modded Like A Mofo And Hibernating

• 1988 VW Jetta - Slammed Slow And Reliable

• 1994 Cadillac Eldorado ETC - Sold

ok man i changed plugs and gaped them to .055 i already had a 180 thermostat and i am still haveing trouble with it breaking up would it possibly have anything to do with fuel. because when the motor is cold like first thing inthe morning it runs like a raped ape but as soon as the motor gets up to temp it starts breaking up. also what size pulley can i run with the mods that i have.

What fuel are you running? You HAVE to run premium in the supercharged cars. I know you said your car was a GT before, so maybe you got used to running regular in it, but a supercharged application requires premium.

Do you have any way of scanning the car to see how its running? Things like knock retard under wide open throttle, timing, O2 values, boost. An aeroforce scan gauge would be a nice addition if you don't already have one.

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'02 Galaxy Silver GTX Coupe. SLP Headers, SLP cat-back exhaust, SLP 1.8 RR, ZZP 3.4/3.25" MPS, SLP hood, SLP CAI, Overkill PCM, 180 t-stat, SSIC, S1 TB, AL 104's, F/R STB's, F-body calipers.

i am running 93 premium and at the present time i do not have a scan gauge.