Might be an injector or injector driver in the ECM. A misfire can be caused by spark, fuel, or compression issues. Even a broken valve spring can let a valve float at high rpm but yet be fine at lower rpms.
If your tune in your original ECM is safe enough for a WOT pull, you could try that to see if it is an ECM issue.
That #8 plug is a bitch to get to, ain't it?
Isn't hot rodding fun?
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Last edited by gearmesh, inc.; 06-27-2011 at 07:16 PM.
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