Are you verifying afr with a dedicated wideband o2 sensor or a tailpipe clamp on sensor?
Verified fuel pressure at wot?
Are you getting a lean stumble/pop at wot?
Mechanical or electric pump?
Dedicated wideband O2 just past the collector (dual exhaust, with no crossover)
No easy way to verify fuel pressure at wot.
No pops or stumbles at wot
Mechanical pump
