My 89 runs very rough between 2 and 3 grand while driving. Im a very good mechanic... Ive built a few cars from the ground up but this time its just got me confused lol.
Check your throittle posistion sensor. Check your o2 sensors. If those don't show an issue then I would suggest an RB swap
Just don't go with rb 20 swap worst choice you could make.
Id stick with the KA before going to an rb 20
RB 20 transmission are not worth a F@$k!!!
need more info. what have you checked?
sr20 or ls swap
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