2000 Dodge 3.0L mising

I have a 2000 Dodge Caravan ith a 3.0L engine that has 37000 miles on it. I have a miss at around 45 mph and every once in a while it will show a check engine light with a P0302 code which is miss fire in cyl. 2. I have changed plugs, wires, cap etc. and still have the problem. Had the timing belt replaced and still the same problem. A mechanic worked on it and said there was arching at the cap and wires so I installed new wires and cap. Still getting miss and after 350 miles plug 2 is beginning to blacken instead of graying. I was thinking of trying another set of wires and cap but want to know what Brand I should buy? I have been using Napa but that does not seem to be working well. I have tried different brands of plugs but was tol I should use the Champion plus so that is what I put back in it. Any suggestions would be welcomed. Bama

 

Running rich on #2. I think you're probably chasing your tail on plug wires, cap, etc. Good idea initially, but if it's still doing it you probably need to go in another direction. I might be looking at a problem with the #2 injector. One of the pro mechs should be along to weigh in on the question.

 

what kind of black plug?....wet looking or a chalky dust black?

 

The black plug is more of a baked on shinny look and not a wet look.

 

that is definetly a fuel or weak spark issue...but you changed everything for the spark soooo...i would have your tech swap injectors with another cyl. to see if the miss move to that cyl....sometimes miss fires are hard to diag.....still could be a valve hanging at that rpm but it is much easier to rule out the fuel issue first

 

I have a update on my problem. I didn't use the van for a week or so but decided to go to a Casino which is adout 70 miles away. Van ran better than normal but still was missing. We were at Casino for a couple of hours and while we were there it started to rain and was raining when we left and the van ran terrible the whole trip home. It was missing bad even at idle speed and ran real rough with any kind of load on engine. I drove van today and it ran about like it was before. Bama

PS I lost at Casino LOL

 

You might try running the engine in the dark and misting ignition wires with water to see if you can find a misfire due to arcing from plug wires. May be something simple like that since it ran poorly in wet conditions. Injector issue also needs to be explored.