Lack of power and misfire codes

1999 DODGE DAKOTA
182,000 MILES • V8 • 4WD • AUTOMATIC
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JOSHGRM
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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.
Jul 27, 2011 at 9:54 PM
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RASMATAZ
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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
Jul 27, 2011 at 10:29 PM
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JOSHGRM
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there is also a change in how the motor sounds it gets high pitched and then it doesn't want to shift.
Jul 27, 2011 at 10:29 PM
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JOSHGRM
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yes the light is on.
Jul 27, 2011 at 10:31 PM
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RASMATAZ
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Check what I've suggested and comeback with some results
Jul 27, 2011 at 10:34 PM
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JOSHGRM
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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.
Jul 29, 2011 at 9:22 PM
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RASMATAZ
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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-
Jul 29, 2011 at 9:30 PM