1997 Ford Contour 2.0 engine IDLE problem

I have a 97 Ford contour 2.0 L and i'm having an idle problem with my vehicle. I got the problem diagnosed and the shop told me that the idle air control valve is bad so i replaced that part and it did not make a difference. Then when i got my vehicle smogged, the technician said the egr solenoid was not working at times so i replaced that and it did not fix my idle problem still. I really want to find out what else the problem might be. Another thing is that i notice my idle is around 1250 when i'm at a red light or stop sign, the idle seems to be normal after i turn the engine off and quickly start the engine up again. I hope you might have some suggestions to what the problem might be. Thanks