1999 Dodge Ram engine missfire

MASTER2090

MEMBER
1999 DODGE RAM
V8
4WD
AUTOMATIC
200,000 MILES

When I start the truck it idles smooth with an occasional missfire. When I rev up the engine to high rpm's it won't missfire at all. Also when starting at a dead stop it will missfire until into the higher rpm's and then run smooth until it drops into overdrive where the rpm's are low again. I just bought this truck so I am not really sure what the problem may be. The past owner said the fuel pump and plugs are new.

Wednesday, March 24th, 2010 AT 7:29 PM

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.

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Wednesday, March 24th, 2010 AT 7:35 PM

MASTER2090

MEMBER
6 POSTS

Ok so I replaced the cap and rotor and was changing all the plugs and wires while I was at it and one of the plugs broke when I was trying to get it out. All the porcelain came out but the metal threads are still in the block. What is the best way to get this out without having to take off the head?

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Tuesday, March 30th, 2010 AT 2:47 AM