Changed plugs and wires on '02 3.0 DOHC. I've had nothing but trouble since! I've changed the EGR valve
- defective, the IAC - defective also, Upper intake plenum gaskets, lower intake gaskets. Have been chasing ( I assume) a vacuum leak. checked the PCV hose, EGR hoses. Codes I'm getting now are 0136, 0156, 1131, 1151, 0171, and 0174. I cant believe that all 4 sensors
have gone bad. Car wants to idle at 1500 after warm up. getting a backfire off of # 2 or 3 on cold start. Idles low at cold start, sounds like it is cammed.
Driving stays at 1500 rpms, pop it into nuetral, jumps to 3600 for 3-4 sec. and drops to just above idle and jumps back to 3000 and back and forth. If I touch the throttle on cold start, it will jump to 2600 and ever so slowly drop. Any ideas???