Re: stumble off idle 750 DP
[QUOTE=Grifter;1783080411]I didn't set up the distributor, my engine installer did, he said it's "pre curved". But when I changed the intake I read the timing it was 25 at idle and 43 at 3000 rpm, it has the smallest limiter bushing from MSD at 18 degrees.
Not sure what the installer meant by "pre-curved". MSD RTR are very adjustable and come with different advance stop bushings and advance rate springs; do you have these? Sounds like pre-curved meant he just put it in as it was and didn't want to take the time to properly recurve it for your engine if that was necessary. If you're not running any vac advance (Beth's suggestion to get one is a good idea, but with a new DP you're not going to be able to do that since you have a secondary with a separate accelerator pump). With your "pre-curved" 25 deg at idle and 18 mechanical, 43 total is a lot of advance. I'd think you would not want to exceed 36 degrees all in. As suggested below, back off the initial timing. Generally, if you stab the throttle and it bogs, you need a bigger shooter to get more initial fuel delivery.
'69 Z/28, Lemans Blue/White Stripes, DZ302, Tremec Magnum, 4.10, Procar Elite Seats,
Custom Upholstery, Dynatech headers, 17" VWW V45's, 235/45, 275/40, C5 Front Brakes