Engine Performance problem
1987 Ford F150 6 cyl Four Wheel Drive Manual 200000 miles
The truck will start with no problem.
It will not idle after being started until the engine temp. Is hot.
If I sit in the truck and pat the accelerator or hold the rpm at 1200 the engine will continue to run.
If I do not pat or hold the accelerator the engine will surge about five times and then stop running.
I have changed the Idle by pass valve, the throttle position sensor, and the coolant temperature sensor.
I have also changed the MAP sensor with no change to the engine operation.
After the engine get hot it will idle and run like new.
Any suggestions to resolve this situation.
Thanks is advance.
Friday, December 5th, 2008 AT 10:45 PM