Can anyone pin point what could be wrong with my 355. I recently had a check engine light on 5-8. The car went in for a look at this issue. The SD2 said lambda high reading that is all. We did a compression check and leak down test and all is good. We serviced the injectors, checked the cam timing, did a smoke test for any air leaks and all OK except for a air valve that we replaced. We also put in new spark plugs. We then put the injectors and everything back in. When we started the car it was idling up around 2000rpm which it did not do before it went in. It lookedlike the stepper motor that controls idling maybe faulty but when it went in it wasn't doing this. Went for a drivbe today and now 1-4 check engine light on and idling at 2000rpm. When I pulled over and shut the engine down, waited for 5 minutes and started up again the engine was idling around 1000rpm and it went well with no lights then started playing up again. Do I have some sort of electrical issue becuase if it was engine related I would suspect the check lights and rough idling to be there all the time. Thanks
Sounds more like a vacuum leak after you put everything back together. I'd check for that and split vacuum hoses before anything else.
