Well im VERY new to this kind of thing, but here it goes, i bought a very clean 95 sl2 from my aunt (who has 5 different saturns) and for about 5 months this has been a very good car, all up till now, the problem is intermittent and i have replace all kinds of sensors, (map, to throttle position, and others) even tho i have no engine light, it still is doing it...
what its doing: first start of the day its fine, warms up and rpm's goto about 1,300 and stay there when at stop lights, sometimes it goes back to normal and back, but always fines its way to rev up. then when i put it in park it revs to 3 then to 300 almost stals then revs back to 3, it does this about 3 to 4 times before it dies. after about 20 mins i will try to start it (do to the fact i dont want to damage the engine.) it wont start. then it will and do it all over again. NO engine light ever. could this be the ECU. or something else

Please any information will help. since no Saturn dealers are around any more and no auto part store will help because of the year. I love this car and dont want to damage the engine so i must walk to school to save her.

 

Sounds like something is amiss in the EGR system -- are you sure there are no codes stored in the computer ??

 

If the engine management system is working correctly it will attempt to compensate for problems, one of which might be a vacuum leak on or near the intake manifold. There has been one or more reports of something like this taking place. As it can not solve the vacuum leak, just cover it up, it wanders around depending on other variables. You also need to run a scan to see if errors are being logged.
Problems do not have to turn on the red light or checkengine light.

 

i had the Ecu check and its fine with no codes stored, however theirs a performance shop in my area and i asked them and they did a procedure that they called ECU RE-LEARNING something about driving the car at low RPM's and then parking the car with e-brake on and leaving the transmission in D, for 2mins or till the ECU smooths out the RPM's this i was told is a temporary fix. so i can look for a vacuum leak. So far its running great not even trying to rev like it was. So i thank you for the reply's and will be most likely going to this shop for the leak.
Thanks