have a tricky car problem, where the ignition coil is arcing to ground. Hope it is part of why the car is running rough. Tried to insulate the coil, looking like there were cracks in the housing, but no go. Supposed to be a high resistance down the line, but so many things to check, and it starts getting expensive, and can be chasing dead ends. Hard to test with 40Kvolts, and tricky devices to rig up to test. Bought a new distributor cap and rotor that runs insde it, that I hope is the problem, but not clear that it could be. Tried to install them yesterday but it started raining. Didn't last so went back out, and then saw I needed to loosen bolts, that may have the tool to make it easy inside the house. Came back and my back was too sore to go back out. Will be nice if I bought the right parts, but wonder. If it is the spark plugs, that will be hard and complicated to change them, since half are on the back side of the motor, and down, so have to lay on top of the motor and reach blindly to try to get to them. Used to be this stuff was fun.