Hi all,

95 Yukon 2wd with $0D. 350, AFR aluminum heads with 2.02 valves, XR258 Comp Cams cam, HEI, 46mm TBI on top of a 2" bore adapter to square bore dual plane intake. Shorty headers, dual electric fans. 255LPH fuel pump with CFM adjustable fuel pressure regulator. The regulator is cranked to 23psi at the moment. Fuel filter is a year old and has less than 10k on it.

I've been able to burn chips and tune it using Dave W's spreadsheet and TunerPro. It runs pretty well, except I cannot get it to stop leaning out and popping when I stomp on the gas. I've adjusted TPS and MAP AE values, PE, etc. but no change in the behavior. Once it recovers it has a ton of power, but that initial stomp damn near kills it.

Any ideas on what to adjust?

Thanks!
Mike