Rough Idle; Acceleration Hesitation from Stop; Backfire
I have a 2001 Dodge 1500 pickup with the 3.9L V6 engine. It has approximately 60,000 miles.
The problem is the truck idles fine when it starts up, but after about 5 mins or so when idling, the truck starts to shake and idle low (about 300-400 rpm). The engine does not stall. I can hear a sucking noise from the Idle Air Control (IAC), and it gets louder. Eventually, the noise, rough idle, and shaking disapears and the engine runs very smooth.
This also occassionally happens when the truck is idling at a stop in drive position. When this happens and I try to accelerate, the truck hesitates and I hear backfiring from the exhaust. The truck loses power and will not accelerate. I have to pull over and try to baby the truck to return to normal. I still hear the sucking noise from the IAC when this happens.
I have gotten a Check Engine Light with the P0132 code (O2 signal wire shorted to voltage) a couple of times. I checked the O2 wiring before the catalytic converter, and the wire seems fine. I have replaced IAC, spark plug, ignition wires, throttle position sensor (TPS), and fuel pump. What could cause this problem? This is happening more often, and it is starting to irritate me. I would like some suggestions. Thanks.