I've got the same problem - turned out to be the CSFI (a.k.a. the fuel spider assembly). GM put these piece-of-trash units in their trucks from 1996-2000 and they get coked-up with junk from the gas tank so the central electronic unit will actually shut off the cylinders one-by-one. Get it replaced - don't even bother trying to get it cleaned. It's expensive either way. But by getting it replaced you'll actually be upgrading it since the original units are no longer sold (wonder why)... You can get them cheapest from GMPartsDirect.com, or you can Google "CSFI to MPFI conversion."
If you are getting a spark to the cylinder thats not working its prob the push rod or the piston and if its not getting a spark than i would check the distributor cap for gunk of maybe a bad spark plug wire let me know how it goes
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Well, First i would have replaced all of the spark plugs and the wires, Then moved to the cap or rotor second, but in that case, did you check the spark plugs and wires, when was the last time they were changed? Maybe they were changed already and that's why you when straight to the distro? Is there a computer code for a misfire, or it feels like a misfire when it's running?
Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor
okay remove your driverside sparkplug the one closes to the front this should be #1 piston put a screw driver in the hole but dont let it bind, slowly click the starter until the srew driver come up all the way up this is top dead center TDC now look at the rotor and where the cap lines up this #1 second is#8 piston on the pass side closes to the fire wall or cab so, on the engine #1 piston234 onthe driver side 5678 on the pass side and in order on the cap it should be 1 8 4 3 6 5 7 2 also make sure you didnt drop the dist in wrong and hav it 180 degrees backwards dont get frustated stop and try again later also make sure this is the right firing order for your dodge i gave you a chevy fire order but i am almost positve this is the order for all v8s
The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.
Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.
I do not believe that it is a problem with a valve/head gasket or cam.