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2005 GTP Hesitation/Sluggish

Have an 05 here too. Same thing with mine Start it up some times it runs fine, then some times runs like hell, shift lags, boggs down. Turn it off restart it rungs just fine. Been like that for years. No one it seems has an answer. No codes new wires. plugs MAF & TB cleaning PCVs. The only thing that I noticed made a little change was when I replaced the Factory battery with a new one, It doesnt do it near as often, So I dont know if the new battery or the reset had any thing to do with it. Runs like a dream when its right. No one seems to know.
 


Unplug your MAF and take it for a drive, try to make the problem happen.

I just got over this I hope (you can read my thread in the supercharged section)... and I think it's gunna be better now.
 
lawadm1 said:
I have a 2005 GTP, and it runs absolutely perfect when the engine is cold. But after the engine warms up, sits for 20-30 minutes, and I restart the car and take of. The car acts like it's not getting any gas, sputters, and will hit 4000rpm just to get going. I always use the Shell 93 V-power gas in it, so I don't think I have bad gas. And then after the engine cools off for a few hours, boom, it's a rocket again.

Any ideas? I love this car, but this is really annoying.

Jeff
Click to expand...
Mass air flow sensor is bad, cleaning them don't help. Or vacuum leak. The EGR to lower intake manifold tube is known to fail
 
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