Mechanics

5.4 BAD STUTTER, BREAKING UP WHEN THE MOTOR GETS UP TO TEMP

1999 Ford F-150 • 192,000 miles

Truck has 192000 miles on it, had a new motor put in with approx 125000 miles on it. About 400 miles later it now breaks up when under acceleration, almost feels like a cylinder isn't firing. Runs perfect when the motor is cold, idle's fine regardless of temp. No error codes from the computer. Have replaced fuel filter, air filter, and just did my spark plugs and no change.
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Rui9671
February 17, 2012.




Is the fuel pressure within spec?

Have not checked that, will check tomorrow after work

Tiny
Rui9671
Feb 17, 2012.
It may be weak.
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