I've replaced: air filter, thermostat, both O2 sensors, EGR regulator, Coolant Temp Sensor, New Plugs , new wires : After driving approx 15-20 minutes, steady acceleration from between 40-50 MPHr - knocking/pinging occurs. Also, when accelerating, the temp gauge needle falls back and then recovers??? Spending lots, gettin' nuthin!!
Have a new fuel filter in hand. What next? HELP! Thanks a bunch.
1998 2.5L XLT 163K miles