Ok i just finished my mpfi swap the other day, and at first i did not have a fast idle, but now when i start the car, the engine revs to like 2000rpm for a few minutes, and then drops the revs to under 1000rpm. I was wondering what could cause this??? I am going to replace the PCV valve today, because when i pinched it, it did not rattle, and that is what my helms books said was the check for that. Would a bad PCV vavle do this to my car??? Also I am not throwing any codes and the car is an 89 civic DX.