Throttle Surge
 

1994 Honda Civic, 1.5L, 210,000 miles. Engine light came on recently.
Car would stall or idle at 200 rpm and surge at 1500-1700 rpm. I have
added fuel injector cleaner to gas and removed air cleaner and cleaned
intake and throttle plate with cleaner. This fixed the idle problem
but still have engine surge at 1500-1700 rpm. What sensor should I be
looking at replacing or how should I proceed from here?