I have a Holley 390 4 barrel mounted to an Offy intake on a 230 6 cylinder. I have long tube headers. It is in a 66 chevy pickup. I can't get it to idle down. I have the idle screw out as far as it will go. I haven't put a tach on it, but intend to tomorrow, but know it idles much faster than before the holley.
Anybody have experience with these who might tell me something obvious I might have missed?
The holley is new.
