i have a 97 gst spyder auto (i know i wish it was manual). it has a few bolt ons and under heavy acceleration(halfways on the pedal) and it seems after 4K rpms it starts to misfire. this just started yesterday. i take good care of the motor. oil change every 3k mi synthtic mobil 1 dealer filters only

 

Do you have a check engine light on? How old are the plugs and wires?

 

ngk wires and plugs about 20k old no check engine code

 

i have a stock turbo, mbc 14psi, greddy ic pipes, greedy bov, aem fuel rail, bm fuel pressure reg, walbro fuel pump, 3 inch turbo back no cat, evo 3 manifold, ngk wires, ngk plugs and thats about it

 

Do a boost leak test.

 

Change the plugs

 

GENUIS i did not even think about that. and ill change plugs as well