1986 Ford F250 ford truck

1986 FORD F-250
104,000 MILES • V8 • 4WD • MANUAL
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HOLLYS6969
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  • 1 POST
when my truck hits about 2000 rpm or going up hill it starts jerking, like its not getting enough gas i replaced the tank and fuel filter, spark plugs, wires and now the fuel pump
May 22, 2009 at 3:02 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
May 22, 2009 at 3:11 PM
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