Anyone have some suggestions: I have a lot of black smoke blowing from the
dual exhasut on my 1990 Chevrolet 454 4-Barrell carb (it's a P30 truck chasis)
, on my RV. On idle it runs fine. On cold it runs fine. When starting out at
normal acceleration, after it's been warmed up, then getting black smoke on
exhaust. Once it's up to speed, then it runs ok, but sometimes the
acceleration is weak. Feels like the choke or fuel/air mix is not right.