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I used a timing light to get the timing down and them I adjusted the carb I took it to get tested again and the thing failed it was missing at about 2500 rpm that's what they make u hold the throttle at and yet I have a good idle at 600 rpm

I'm sorry it's an 1988

I realized my idl was at 900 and I am playing with the timing and carb got it at 600 now

I just got this jeep it failed emissions and my results are as listed HC: 592 fail limit is 220 CO: 3.92 fail limit is 1.20 Any suggestions to what it might be it runs fine