Stalls at idle; problem starting after refuling

could be the throttle position sensor

Certainly sounds like the ac compressor is stalling the vehicle. This usually occurs when the high pressure switch in the system is faulty, and not deactivating the clutch temporarily when it senses a high pressure in the system. An intermittent failure in the switch is not uncommon - try having it replaced.

ONe of the "easy" fixes is buy a can of throttle body cleaner. Remove the air intake near throttle boddy and clean the inside of throttle body as best you can this should help it. If it doesnt have it checked out it could be more advanced problem. Good Luck.

The throttle body needs cleaning, grime and debris has built up on the throttle plate and surrounding area preventing throttle plate from closing completely at idle.

Throttle body needs to be cleaned.

2002 saturn sc1 battery died,replaced,now cranks but won`t start

I’m happy to help further over the phone at https://www.6ya.com/expert/kenneth_3efc1f8510674f04

have autovone check the alternator

should idle around 700

try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

Sounds likes a Idle Air Control valve IAC problem.