I have a 1995 civic ex with the d16z6 engine after car is warmed up interim my idle will be very low like 200rpms and it shakes badly when the clutch pedal is depressed. Luckily it has not stalled yet. This morning I had the idea that I did not have this problem all winter so I turned my heat on full blast. When the heat is on my car idles normally but as soon as I turn the heat done to 2 or less it starts to idle low. Any ideas on repair would be greatly appreciated.