David, Adjusting the valves should be considered as a "last resort fix". If the problem is other than misadjusted valves, which it more than likely is, adjusting the valves will significantly complicate the troubleshooting process. Ninety nine percent of poor engine performance in the De Lorean PRV is related to fuel and or ignition problems. Your other suggestions are very accurate. "We're here to help you" DMC Help / De Lorean Services / <dmchelp@xxxx> Web Site: <www.deloreanservices.com> ----- Original Message ----- From: <jtrealty@xxxx> To: <dmcnews@xxxxxxxxxxxxxxx> Sent: Wednesday, February 28, 2001 10:33 AM Subject: [DML] Re: High idle probs... > For the backfiring try adjusting the intake and exhaust valves, since > I don't know how many miles are on the motor it could just be a tight > intake valve adjustment but it could also be, bad ignition wires, > cracked dist cap, overly lean fuel adjustment.