Thd truck will sptter and cough at a low idle or a stop. Pressing the pedal to the floor will result in the idel smoothing out and the truck continues on without a hitch. No problem at highway speeds at all. The following have been changed:plugs, wires, coil, Throttle postitions, O2 sensor, IAC, MAP, and Fuel Pump. The only codes we have goten are small and large EVAP system leaks and an oxygen sensor. I am at a loss. Thinking maybe PCM? Or the natural vacuum leak detection switch. Any help will be appreciated.
have the same problem?
Wednesday, July 22nd, 2009 AT 1:03 AM