My car runs okay when driving, at iddle the engine run between 600 and 1000 rpm, but when I keep the engine iddling for 15 to 20 minutes, check engine light comes up but the engine does not stall.

If I engage the gear after engine warning is on and start driving the car will lose power and move very slowly.

If I stop the engine and re-start after five minutes and start to drive again, the problem goes away and the car drives fine..

I took the car to the garage and they changed the Air Intake control but the problem is not solved.

Any suggestion before I spend another $$