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.
Is the fuel pressure within spec?
Have not checked that, will check tomorrow after work
It may be weak.
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