Thanks sir afrasay, that pretty much answers my question -- so dapat talaga i compensate lang yung added load, and should idle at same rpm, mine idles at 750 and goes to around 800 kapag nag on ang a/c kaya cguro lakas ng jerk.

mejo O.T....given ng 750 ang RPM ko without lights on...pero at night nasa 700 lang because of the added load ng headlight...normal lang ba yung ibinababa nya?

TIA!