Engine Performance problem
1993 Pontiac Trans Am V8 Two Wheel Drive 160,00 miles
i have a 1993 transam that i just purchased.the car idles up at 1,100 rpn and it wont idle lower.i also find that the performance is not the best.slow to respond and lages at times.the tail pipes are black from running to rich.i haven't checked the plugs yet to see if it is running rich or too lean.could this bee a vacume leak? intake leak? thanks for your time.