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Discussion Starter · #1 ·
at the top of my gear when its about ot shift my gn starts to studder and hesitate and i get knock but once it shifts its ok untill its time to shift into 3rd, tried replacing the coilpack and plug wires but it still studders and hesitates does any one no why? and it's not leaning out because i set my fuel pressure a little high just to make sure, and i dont think its the tranny because its in pretty good shape
 

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sounds like detonation if the coil/module swap did not fix it.

Does the fuel pressure rise properly and hold under boost?

Most likely you have either a fuel shortage or too much boost. Hard to know without some facts.
 
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