I have an old 750 d.p. that I put on a proform main body. But I think that this problem was there before I did the main body change (it was years ago). I had the engine dyno'd so I know wide open throttle the air/fuel is right where it makes the power and is Plenty safe. Problem is cruising. Even just sitting there, if you open the throttle to "off ide" circuit, you can see the fuel dumping in and the motor actually kind of burbles. Thing smells WAAAAAAAAAAAAAAAY gassy. TERRRRRIble fuel mileage. Is this off idle circuit in the main body or is it in the metering blocks?? (Have a brand new p.v., lowest one they make with the blowout kit)