Thank you! You're helping me narrow it down. I just replaced all of the plugs, wires, cap, and rotor. I have no valve noise and I think there was some work done on them a few thousand miles before I bought the car. The car ran great before, but I shouldn't completely rule out timing. I think I fixed my vacuum leaks, but again, I shouldn't rule it out. I'm thinking it may be the injectors. I'm sure after over 20 years they're likely to have some sort of build up in them. Although I don't exactly have money to spare right now, my beloved DeLorean is worth it. It certainly wouldn't hurt to have them cleaned or replaced. payne devoted owner of #2975 > For a smooth idle you need to have all of the cylinders balanced very > close to each other. That means compression, spark plug gap, valve > adjustment, injectors, etc. After you are sure all of the mechanical > parts are good then you can begin to attack the control systems. Rule > out vacuum leaks, timming, bad ignition wires. On the injectors it is > not so much a plugged up on as it is a dirty one. Dirt will cause a > bad spray pattern and low holding pressure. They will have to be > removed and tested to make sure they aren't the problem. > David Teitelbaum > vin 10757 >