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im no expert but i used to have the same problem with my carb.... then i replaced it with a weber.... i know something was broken inside mine though but if yours was rebuilt 3 weeks ago i wouldn't think that would be the problem.... did you do the rebuild or did a shop do it... if the shop did it i would take it back to them and describe to them whats going on and see what they say but the black on your filter is it oily or is it dry... if its dry i could be a small back fire from the carb cause its getting to much fuel
yet again IM NO EXPERT ON CARBS I HATE THEM 10000% but they get the job done and i don't want to drop alot of money on fuel injection
i hope this helps you in your quest on fixing you jeep good luck to ya and welcome to the forum
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/l ,[_____], 1990 YJ 4.2 Weber 34
l---L -[]lllllll[]- 4in Rustys, 3in body, 1.25 Shackles
()_) ()_)--o-)_) 33 Kumo's M/T and smittybilt tube fenders -----Johnny Rat-----
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