Gold Lifetime Member
Join Date: Sep 2006
Location: The Bluegrass State
Re: Part idle bucking and surging - holley 750
I drove the car to a cruise tonight, and it is definitely a lean idle condition. It will stall when in the idle circuit even if the idle speed is cranked up to 1800 RPM or so. When I give it gas, the accelerator pump gives a shot of gas and it instantly smooths out. Idle mixture screws have no effect. It runs fine at higher RPM's - at 3000 RPM on the interstate, it ran great all the way home. As soon as I got off the exit, it wanted to die. What do you guys think? Blown power valve? I always thought you got backfiring through the carb when that happens. No symptoms like that at all. It just won't idle or run smoothly at lower RPM's. I guess I'll pull it apart this weekend and put a kit in it. Is there a procedure to test the power valve?
1967 RS/SS 350 Conv - triple black, 4sp, tach & gauges
1969 VN-built RS/SS 396 Conv - Garnet Red/Black, 4-sp, tach & gauges