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Ok I changed air filter and put in new plugs and still have the same problem. Any mor ideas? Thanks. Btw plenty of spark from coil and dist. Would dry rotted vac lines cause this problem?

Tomorrow I will put new plugs in and check for right gap and install new filter and I will let you know if that was my problem...I sure hope it is!

Thanks so much! I'm getting a air filter now.

The guy I took it to last week said my air filter was clean and I went and checked it just now and it's pretty dirty. You think that would do it?

I have a good clean air filter. My plugs are just auto lite plugs. Never seen nothing like it. Tomorrow I am going to go ahead and change thermostats I figure it won't hurt.

I have a 88 YJ 2.5 L 4 cyl it seems to be over fueling and fouling out my plugs. Hooked it up to diagnostics and showed no codes or errors. I was told possibly thermostat, would that do it? Please any info at all would be greatly appreciated. Just had a new tune up a week ago and new plugs...