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it could be anything.
same as always: check the basics.
check for spark on all 8 cylinders (i assume by you checking a million times, that you already have).
Check fuel pressure at prime, idle, and under a load.
Recheck your base timing as well...
after checking all that, see where you are at.
By the way, what do you mean you "basically have a maf tpi system?" whats not basic about it?
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87 iroc with the usual go fast stuff
heavier than your half ton.
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