Ok when ever I turn my a/c or heater on my car idles really low where the tach wouldn't read and my VAFC reads like 1 sometimes 2 on the throttle percentage(not.1% or.2% its 1 point something).Does Anybody know what can cause this problem.Thanks for any help

 

What you are experiencing is voltage drop.... usually the problem is a faulty alternator or bad relay within. Troubleshooting an automobile electrical problem is sometimes mind-boggling.