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question about a yj 4.2 02 sensor

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hoping someone here has an answer, i hate asking anything on JF cause you get so many different answers your usually more confused after asking than you were before you asked.

on a 89 yj with the 4.2 engine what does the 02 sensor control? my thinkng was it would effect the fuel somewhere in the carb

but the carter was changed out for a weber so that wouldnt be the case anymore right? does it have anything to do with the

spark advance at the distrubitor maybe? i was thinking the distrubitor was vacuum advance but can't remember.

having a problem on my gf's wrangler seems to run on sometimes and then sometimes wanna stall out at idle




Thanks John

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