ELECMAN

At idle the car engine shakes alot after starting up black smoke soots of the back for a few seconds.I have a 455 engine with a mild cam,GA heads 20 over any ideas also have a rockchester 7042251 rebuilt about 2 years ago

oldcutlass

Vacuum leak, carb dribbling fuel or not adjusted properly, timing, bad plug or wire, start with the basics.