Blow by is the problem. Just take the line off at the air cleaner and route it towards the ground. You don't need it to recirculate. That way you can save the air filters. Make sure you plug the hole in the air cleaner so its not sucking dirty air through your motor
I had the same problem once I put on my weber and that's what I did to 'fix' it. (or at least save the air filter)
'84 CJ-7 Junkyard TBI 360/T18/D300, 4" 4WDH Lift, D44 front with ARB and HS/D44 Rear w/ Detroit, 4.56s, 36" Iroks, TFI, TJ flares, Homemade rocker guards and bumpers with swing out, Optima Yellow Top, M8000, York OBA, 6pt cage
"when you're up to your *** in alligators, it is hard to remember that your original intention is to drain the swamp"