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Old 03-09-2002, 01:56 PM   #1
306 BLUE GT
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Join Date: Feb 2002
Location: New Jersey
Posts: 15
Default High end missfire?!?!?

I just recently got my car back from the engine shop with a fresh 306. Everything I have is new except for the igniton and an aftermarket chip...I havn't installed them yet. Here's the problem. I can get to about 3500 rpm before it starts to break up and even backfire horribly. Is this because I havn't changed the stock ignition, or is a new chip really that important on a modified engine? I'm running roughly 50 lbs of fuel pressure on 24lb injectors. Please help...i'm frustrated.
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