1999 Ford Truck 4.6 Liter engine idles fine

Tiny
LGRENDELL
  • MEMBER
  • 1999 FORD TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 155,462 MILES
Idles fine but when you put a load on it it seems to be cutting out. New plugs and wires. Tail pipe looks black inside. No check engine light.(Unusual )
Tuesday, July 28th, 2009 AT 1:59 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Tuesday, July 28th, 2009 AT 2:08 PM

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