Why does the car cut off when you put it in gear?
on 2006 Suzuki Grand Vitara

Cranks and runs until put into gear then shuts off but if you hold the brakes and slightly mash the gas it stays running. at night when you mash the gas, the lights get brighter.

Asked by for the 2006 Suzuki Grand Vitara
Weak battery? My brother had a similar problem with his Aerio, and it was a bad battery