Specs: rebuilt factory carb (17082204 E4ME), SBC 350, iron vortec heads, "baby hot cam" (215/223 LSA 108 473/473), flat top pistons, custom prom (L69 timing tables stepped down for vortec heads and target rich/lean set to .6 from .41), and custom MAP sensor voltage regulator to boost voltage signal
Car runs great except at idle... In park it is less noticeable but in gear it's honestly annoying. Basically, I'm getting a weird surge that shakes the vehicle for a few seconds then smooths out. No trouble codes, and dwell is varying between 30-35. I don't expect this thing to idle like a stock engine, but this feels almost like a misfire. Plugs are just a hair lean and introducing/removing air from the carb does not seem to improve things.
The only two things that come to mind is the knock sensor interpreting things wrong at idle or the volume of air/fuel in the idle circuit is simply insufficient for my specs.
Car runs great except at idle... In park it is less noticeable but in gear it's honestly annoying. Basically, I'm getting a weird surge that shakes the vehicle for a few seconds then smooths out. No trouble codes, and dwell is varying between 30-35. I don't expect this thing to idle like a stock engine, but this feels almost like a misfire. Plugs are just a hair lean and introducing/removing air from the carb does not seem to improve things.
The only two things that come to mind is the knock sensor interpreting things wrong at idle or the volume of air/fuel in the idle circuit is simply insufficient for my specs.