[dewaynep]

Before you go through all of the other great help provided here, do yourself a favor and get an actual AC/Delco Rotor. Before you put it in, compare the electrode length on the aftermarket rotor to the AC/Delco one. I found the the very expensive aftermarket rotor I had installed was about 1/8" to 3/16" shorter than the AC/Delco. I put a new ac/delco rotor and cap on and haven't looked back, no more misfires. I attribute the misfires I had to the increased gap between the rotor and cap causing scattered spark. Good luck.