i just built up a .030 over 454 and haave some small tuning issues. when you are driving down the road, you can feel a miss, but it doesnt pop out the exhaust. i came home, checked the timing, and it was on ( 10 degrees),so i checked the plugs. they are all light brown. i have a vacuum gauge in the car, and when you are driving it reads a steady 20 inches. at idle it waves from 15 -18 inches. i changed plugs, cap and rotor. it has a pertronix "eye" in a point style distributor, and a vacuum advance that maxes out at 20 inches of vacuum. does this sound like a bad distributor? i am lost on this one!