I have a 1998 Dodge ram 1500 it started cutting out at 3500 rpm. The check engine light came on( mis fireing not running on all cylenders) after looking it over I realized the coil plug on the top of the ditributer had broken off. I repaired cap and rotor but it is still doing it. Any help?
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Your truck is OBD2 compliant take it to a local auto parts store and have them read the code for you they usually do this as a free service, if it doesn't have a obd2 port then your truck is not a 1996 vehicle.
If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?
there may be a software update for the powertrain control module for mis-fire monitor. check with your local dealer. but if thats not the case,these engines are known at least in my experience of having the heads crack between the valves and cause mild mis-fires. try compression testing all the cylinders and performing a leakdown test on them as well.
sounds like you have a bad alternator the alternator generates power from the engine which in turn keeps the spark plugs firing (and all other electrical components) the higher the rpm the more power you can generate up to about 3500 rpm or so I suggest removing the alternator and bringing it to your local auto parts store to have it tested I would also bring the battery and have it charged since you don't want to put a new alternator with a less than full charge on the battery (you can damage it)
WARNING:On older vehicles it was common to check the alternator by starting the engine then removing the battery terminal ... (if the engine died the alternator as bad) However on newer vehicles you could damage more important and expensive electrical components including the computer or brain of the vehicle.