Re: 600 holley stumble off idle
Make sure the umbrella seal above the accelerator pump is good, if you didn't replace it, take it back apart and replace it now, then adjust the arm per Holley specs. It should move the second your linkage moves
Also, make sure the check ball, actually bullet shaped, is in place under your squirter.
If the car didnt stumble before the accel pump change, it should not require any change in design, it has to be something you did or you missed.
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.