Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Do you happen to know what codes are being stored?
Does it stall when idling?
Does it fire right back up?Also, any idea on the codes?
I would try pulling the front O2 sensor on bank*****it. See if it stops stalling, the code P0420 points to the catalytic converter and if it's plugging up when it gets hot it will cause the P0300 and stalling issue. Lot's of times the vehicle will idle without a problem even when it's blocked, but under load it will stall.
It may also need a tune up, some plugs and wires on it. If they are old it could be loading up with fuel causing it to shut down. Finally, check the fuel pressure, if the pump is weak it could cause this concern as well. This is if removing the front O2 sensor on bank 1 doesn't help anything.