feonnixxx 
I have a 98 GP GTP and every time the boost kicks in the supercharger sputters and decreases power. I am having to keep performance shift on in order to give myself enough power to pass someone. when its cold (i live in mn) it seems to run just fine but as soon as the engine slightly warms up it starts sputtering. it doesnt matter what gear im in but in high gear when the super kicks in at low rpm's it starts to really affect my power, it starts jumpin a little bit. the messed up thing is the check engine light doesnt come on even if i pound on the gas (trying to cause a light to come on) anybody know what might be causing this?
