Hi,
Continued from Intro Post "learning curve".
1992 K1500 Blazer 4x4, Vortec headed SBC 6.3 stroker, TBI 65# bored to 1.930", NV3500 5 speed.
replaced ignition parts chasing misfire, cap, rotor, module. changed fp to 12 psi to bring the tune as close to stock as possible as a starting point. Hooked up the heat to the NB that is hooked to the ECM.

Runs good at idle and cruise, stoc with crossovers, even a part throttle tip under a load and it lugging a little, ain't half bad. But when I lug it and dump it to WOT a get a single lean pop followed by what feels like a dead miss as RPMs come up.

it's got to be a bad spark plug. if it was mixture distribution or lean mixture it should be popping out the intake.

Is the stock tune that far off? 299 AWLD.

I'm starting to dislike TBI and yearn for TPI or MPFI. Is anyone happy with TBI performance?

Certainly I'll check the plugs and maybe compression, it better be good on a fresh build.

Anyone running First Fuel Injection tuned port setup?