it seems when my car is warm the idle and battery (alternator) voltage drops and the car wants to and has stalled when stoped or just idling kinda getting anoying. doesnt happen all the time and if it was the alternator wouldnt the car not start?

 

To an extent what you said was right. The car wont start if the battery is dead. However, the alternator supplies voltage for your car to run ,and keeps the battery charged. So your car can actually run off the battery for a short time w/a dead or dying alternator, as long as it has charge in it. Ill bet its' the alternator.

 

Check and see if your cooling fans are running all the time. My car will also drop the voltage, dim the lights, etc. at idle. Fixed the cooling fans, and the problem is a lot less.

You may also want to check for vacuum leaks.

 

it starts everytime and runs fine till everyonce in awhile it just starts to drop feels like its gonna stall and has a few times but allways starts right back up