started doing it a couple days ago and I figured it was teh cat, so today I finally crawled under it and gave the cat a few whacks but its not rattling... could it be something else, fuel pump maybe? it idles fine and runs like a champ up to about 3700 rpm, and sometimes it'll run perfect throughout the rpm range, but it seems like the more I drive it the worse it is getting, and there's still no CEL. I just wanted to get some oppinions before I start throwing money at it
97 xj, 4.0, aw4, 106,000mi, all stock except k&n (~2k since cleaned/oiled), APN header (checked and no leaks on exaust or intake), accel coil (~15k miles) it does have ~10k on the cap/rotor/wires/plugs so it is due for a tuneup, but I checked the cap/rotor and they still look 100x better than when I bought the jeep and it had 75k on the original cap/rotor, plugs look fine too
97 xj, 4.0, aw4, 106,000mi, all stock except k&n (~2k since cleaned/oiled), APN header (checked and no leaks on exaust or intake), accel coil (~15k miles) it does have ~10k on the cap/rotor/wires/plugs so it is due for a tuneup, but I checked the cap/rotor and they still look 100x better than when I bought the jeep and it had 75k on the original cap/rotor, plugs look fine too