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98 dodge ram 1500 5.9 multiple cyl misfire. cyl 1 misfire, cyl 6 misfire. idles great, bogs on hard acceleration only. above 3k rpm. replaced cap rotor wires plugs. still the same problem
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Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.
I'm guessing you have over 100000 miles , definitely replace all the spark plugs and ignition cables and cap and rotor if your motor is such equipped. If you want a better idea of which cylinders are misfiring, go to your local Checker or Autozone and ask them for code retrieval, codes stored will give you an idea of what is failing. Code po300 is multiple misfire, po301 is cyl #1, po302 is cyl #2 and so forth.
I had a similar problem with my Dodge truck.I replaced the cap, rotor, plugs and wires and the check engine light went out. Within 4 days the light came back on with codes for multiple misfires..To make a long story short, I put electrical tape on the wires to adjacent cylinders and the problem was solved. Answer; The pluig wires they are making for Dodge are really cheap!
all the 300's are multiple misfire (300) 301 is misfire at cyl#1, 303 is cyl#3, etc. 340, is camshaft position sensor malfunction, and 455 is a Leak in your evaporative emission control system, Fairly large one.
Check all your vacuum lines running through it, as well as gas cap is good. My guess is to, that once Camshaft sensor is replaced, all those misfires will be gone as well.
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