Idle quality (hunting) is directly affected by vacuum leaks, a breakdown of the secondary ignition system dirty or missfiring injecters, and an out of balance cylinder ie: low compression, burnt valve etc. You have to remember that the engine operates like a wheel, it keeps going around so if 1 cylinder's output is lower (or higher) than the others whenever it's turn comes around it will fire a little differently than the others causing the engine to speed up or slow down then the idle system tries to correct it but it can't react fast enough to cancel out the effects of 1 cylinder so it over or undershoots resulting in "hunting". A properly tuned motor when warm will hardly hunt at all. A cold motor will hunt a little initially but quickly calm down as the cold start valve shuts off. To improve gas mileage you might need a tune-up and or a mixture adjustment. The mixture screw is a very sensitive adjustment so if a 1/2 turn isn't making a difference you probably have a vacuum leak somewhere (which might account for your bad gas mileage) David Teitelbaum vin 10757 --- In dmcnews@xxxx, Joe Palatinus <jpalatinus@xxxx> wrote: > As soon as you start a delorean its idle should seek for a brief period of > time. It should go from like 500 to 1200 rpms for a minute or to if it is > cold. My delorean which is noy getting the best gas milage and has a