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1997 Dodge Ram Engine Stumble

Tiny
MANOMYTH
  • MEMBER
  • 1997 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Yea, my truck has a problem of when you try to cruise at one speed it stumbles and coughs or backfires, but if you speed up or slow down it runs ok, but it won't stay at a steady speed. I am thinking it has an intake leak around the plenum. What do you think?
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Tuesday, February 9th, 2010 AT 12:52 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test all the following below:

Oxygen sensor
Catalytic converter
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
Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
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Tuesday, February 9th, 2010 AT 2:08 PM

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