If as you say it was running good and then bad and then good after you messed with the mixture screw, the mixture screw can't adjust itself so you have compensated for a change in the mixture by adjusting it. I believe the problem is the lambda system as if it isn't running it results in a lean mixture which you corrected for by turning the mixture screw. You should hear a loud buzzing noise comming from the right valve cover. If you don't, check the lambda relay and fuse #7. You really shouldn't mess with the mixture screw, try to put it back to the adjustment it was before and make sure you have the hole above it plugged securely (No vacuum leaks). The most likely is a failed lambda relay and they aren't expensive but make sure the fuse hasn't blown just in case. Refer to workshop manual D:04::04 to 15 for placement of components, specs, and troubleshooting. Since you are a new owner a workshop manual and parts manual will become your best friend so if you don't have them you should order them with your parts order. Even if you can't understand them having them so your mechanic can refer to them will save him time and you $$$$. The fuel system is one of the more compicated systems and most mechanics are not familiar with the Bosch K-Jetronic. David Teitelbaum vin 10757 --- In dmcnews@xxxx, scott-c-arnold@xxxx wrote: > Since shortly after I purchased my DeLorean back at the end of > September, I started having engine trouble. It ran fine during the > test drive so I even drove it home from Chicago to Missouri. > Sadly, one of the reasons I bought it was because it ran well. At > least it lasted for the trip home! Since then the engine has had > trouble idling and won't accelerate -- The engine will not idle when > cold, and the engine tries to cut out and die rather than speeding up > when the accelerator is pressed