Hey I have a 2001 chevy 1500 and for about a year now I've had a low idle and occasional stalling. When it is acting up it dosent matter if it's in park or drive. I've cleaned my throttle body changed plugs and wires new fuel pressure regulator mass airflow sensor throttle position sensor idle air control valve and crankshaft position sensor. Problem is still there. Took it to the dealer and they replaced the crankshaft sensor again saying the one I put in was bad and re cleaned the throttle body. Still nothing can someone please help me with this issue