Thanks to John and David (advice below) I fixed this problem. Put plugs, rotor, dist. cap, plug wires, and O2 sensor. Runs like a new car. Can anyone pass along info on how to adjust the airflow mixture? Ed 10541 ----- Original Message ----- From: <dherv10@xxxx> To: <dmcnews@xxxxxxxxxxxxxxx> Sent: Tuesday, April 03, 2001 12:04 AM Subject: [DML] Re: Cold engine performance problem > Ed, From what your describing, I thing you need a all around tune up. > Plugs, wires, cap, 02 sensor, so on. Has anyone took the dist cap off > and looked inside. Be sure that when ever the 02 sensor is replaced, > that you adjust the air flow mixture after the car heats up. Then go > for a drive to burn off the rich mixture that may have built up on > the 02 sensor. If it gets contaminated, you will have the problems > your describing. Call if I can help. > John Hervey > www.specialTauto.com > 800-413-3300.9-5 m-f. > >Before tearing into the fuel system to look for gremlins if the >ignition wires and spark plugs are old try replacing them first. Also >do a visual inspection of all of the vacuum hoses to see if they are >on, correctly routed, not brittle, etc. Is the fuel fresh? If the car >has been sitting and there is old gas in it it is less volitile and >won't burn good until the engine gets hot. I have seen cars that sit a >lot and the owner just keeps topping off the tank so the old stale >fuel sludges up in the bottom. Another thing peculiar to Deloreans is >that the plugs sit in a "well" so if any moisture gets in there it >will cause a breakdown of the ignition wire going to the plug. Is the >car kept outside or is it garaged? Is it worse after a rain? >David Teitelbaum >vin 10757