Mike, To check to see if the Vacuum solenoid is working ok, Put your hand or fingers on it while your reving up the engine a little and you will feel and may hear the clicking inside it. If you do then the solenoid is opening and closing as you engage and dis engage the idle speed micro switch. Very seldom do they go out. I have never replaced one. John Hervey www.specialTauto.com -----Original Message----- From: billsfanmd@xxxx [mailto:billsfanmd@xxxx] Sent: Tuesday, May 13, 2003 7:13 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: Re: [DML] Re: Warm-up problems I hear people talk about the spark advance solenoid located by the distributor...Looks like alittle flying saucer :-) Is there a way to check to see if it is bad? mine has the vaccum lines on it and the electrical plug but just wondered the failure rate and symptoms? This does not seem to be a part you would normally replace on a tune-up. Mike C 2109