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Hi, I've been following the thread at http://www.impalassforum.com/vBullet...d.php?t=247741 because the problem sounds a lot like mine. Engine stumbles at high rpm, just before changing up, then pulls hard till the next change. I've got a 383 low compression (9:1), supercharger, 50lb injectors, new Racetronix\Walbro pump and harness, MSD 6, MSD optispark and coil. Tune by Brian Herter. Having read the previous thread I strapped a fuel pressure gauge to the windshield and fitted the air\fuel gauge.

Took the car for a run. Pressure gauge rock solid at 45psi, but air\fuel dropped from 14.7 to 11.1 at WOT with engine stumbling.
Any thoughts\advice?
George
 
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