I have a 99 suburban C 1500 w/5.7L and 2WD. I have 150,000 miles on the car. The engine was replaced with a remanufacted one 10,000 miles ago and tranny rebuilt 20,000 miles ago. I am having a problem with the truck shutting off while at highway speed and while sitting still both in park and in drive. The tach will elevate a few hundred rpms and the gas needle shakes back and forth whiole the car is at idle or being driven. I have replaced the fuel pump, fuel pressure regulator, fuel filter, cleaned the injectors, replaced all plugs, wires, coil, distributor cap, and rotor. No one seems to be able to diagnose the problem as it isn, t throwing any codes to the pcm. My thoughts were that the fuel level sending unit may have a short causing the needle fluctuation but as far as the dead stall I am at a loss. Had both transmission specialist check tranny and was ok. Mechanic unable to find fault with the engine with the pcm module. Any ideas would be greatly appreciated.
Saturday, May 6th, 2006 AT 3:02 PM