PROBLEM:
tuwing binubuksan ko aircon...medyo bumababa idling...and normal naman yon talaga...pero...paminsan minsan...kapag naka neutral...bumababa pa onti onti..den normal nanaman...tatakot lang ako baka kasi kapag tumagal...eh mamatayan nako...with or without lights on...ganun parin...
Pare tama si boss mazingerZ "idle air controller valve (IACV)" yan. Try cleaning that with carb or brake cleaner. Pati ung air filter linisin mo or pa-vacuum. Have the same problem with the same car 98 civic vti last month lang. Search mo lang sa forum or with the help of GOOGLE.