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Hey guys, I have a 92 civic hatch. The guy I bought it off of swapped heads and put a 1.6 V tec on the 1.5 block. Ever since I have had it, when the car is idling with the engine warm, the rpms will stay steady, then randomly drop. The rpms don't drop too much, maybe 100 or 200 then it steadys out again. I replaced the IACV and cleaned the throttle body. Any other suggestions? Thanks!
Matt from brantford, Canada

 
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not sure if this has anything to do with it, but maybe you need a new oxygen senor.
to have a steady Rpm.

 
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Oxygen sensor eh.... Is there any way to test to see if its junk? I had it up on the hoist about a month ago, and everything from the headers back to the muffler looks brand new.