2000 Dakota 3.9 Intermittent Misfire
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2000 Dakota 3.9 Intermittent Misfire
Hi, I have a 2000 Dakota that has an intermittent misfire when going up hill and letting the engine lug rather than stomp the gas and make it down shift. I have replaced the cap and rotor, spark plugs, coil, and spark plug wires. At one point there was a check engine light for misfire on a single cylinder, replaced that injector and the light has not come back on even when the engine misfires. I think there is a vacuum leak; the ac will stop blowing out of the main vents and only blow out the defrost vents. This does not always happen when there is a misfire and it does not misfire every time I loose ac. The fuel gauge is beginning to go bad as well, showing no gas when there is anywhere from 1/4 to 2/3 tank. Most of the time a key cycle will bring the gauge back. 303,000 miles on the truck. Do I start by finding the vacuum leak? Replace more injectors? Could the fuel gauge starting to fail be effecting the pump as that is all one unit? EDIT: I replaced the timing chain about 5,000 miles ago and made sure to get all of the timing marks lined up, problem existed before I replaced the chain, but replacing the chain did fix the noisy lifters.
Last edited by dan'sdakota; Sep 7, 2023 at 06:45 PM.
