'94 Surging in gear at idle

[Schrade]

Were you gettin' an O2 code too? :confused

Has it run closed loop yet?
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[formul8]

Were you gettin' an O2 code too? :confused

Has it run closed loop yet?
​

That's the thing - no codes for o2's or anything close. Was getting the "knock sensor circuit" code 43. I could tell when it was switching loops before because that is when it would struggle and the CEL would come on and then smooth out a bit.

Put about 20 miles on it and CEL is not coming on anymore, no more soot from the left tailpipe and idles MUCH better!!