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Lack of power and misfire codes

Tiny
JOSHGRM
  • MEMBER
  • 1999 DODGE DAKOTA
  • V8
  • 4WD
  • AUTOMATIC
  • 182,000 MILES
The truck is showing a misfire code for #4 and 6 cylinder also random misfire code. It idles great and will slowly take off ok but when you floor the gas or get above 2000-2500 rpm it bogs down. I just replaced all the plug wires, distributor cap, rotor and coil. I replaced all this because originally I was driving down the highway and it died on the interstate then it wouldn't start now it does but it says it misfires an bogs down.
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Wednesday, July 27th, 2011 AT 9:54 PM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light? Check the sparkplugs, compression and injector for no.4/6 cylinders-Random misfires are normally caused by vacuum leaks and contaminated fuel-

Refer to this link for additional information: https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Wednesday, July 27th, 2011 AT 10:29 PM
Tiny
JOSHGRM
  • MEMBER
  • 4 POSTS
There is also a change in how the motor sounds it gets high pitched and then it doesn't want to shift.
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Wednesday, July 27th, 2011 AT 10:29 PM
Tiny
JOSHGRM
  • MEMBER
  • 4 POSTS
Yes the light is on.
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Wednesday, July 27th, 2011 AT 10:31 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check what I've suggested and comeback with some results
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Wednesday, July 27th, 2011 AT 10:34 PM
Tiny
JOSHGRM
  • MEMBER
  • 4 POSTS
The spark plugs looked normal compression test was great and I spray throttle body cleaner to check for vacuum leaks and it did nothing as well.
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Friday, July 29th, 2011 AT 9:22 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-
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Friday, July 29th, 2011 AT 9:30 PM

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