vibration from engine when in reverse or ac is on?
 

martin dS 92 honda accord , rough idle when airconditioning is on?have a 92 accord has the 4cyl. 2.2 engine. when starting engine it appears to sound fine. however aftering warming up, and putting it in reverse or running the airconditioner. im getting a rough idle speed and a vibration. after accellerating down the road everything is fine. comming to a stop sign, i get the rough idel and vibration again. can anyone help i was told maybe motor mount but i don't know which one. i did feel the front mount it seemed to wooble around i can move it back and forth but i don't know if this is normal or not...........

Tune-up and idle speed may be set too low, possibility for the motor mounts, have them checked when you do the tune-up.

Could be idle air control valve IACV. Remove it, clean it with carburetor cleaner - DO NOT clean electrical part. You may need to adjust it 1/8 turn - 1/4 turn clockwise using a special tool with a Pentagon head ( not hex head). I have same car with same problem, after I did all above car run fine. Oh IACV is locate in front of fuel injection system around PCV valve have two small cooling hoses and one electrical connect to it. See it here http://www.kaboodle.com/hi/img/a/0/0...AAAAAA_HbQ.jpg