intermitent idling
 

1990 bonne 3.8L at times this car runs great other times I have to drive two footed to keep it from dying due to low rpms. I have noticed that when itdoesn't want to idle I lose my A/C and usually my speedometer. It has a small drain on the battery and if I shut it off while it wont idle on its own I only have about 36 hours before the battery is dead if it is idling fine when I shut it off I can restart it even 2 weeks later. Please someone help. Its an SSE fully loaded with moonroof leather full pwr and an awesome 10 speaker stereo. Thanks for your help