Stalls when placed in reverse

it sounds like a crank sensor if the vehicle stalls in any gear or when cold its most likely a crank sensor. located near the bottom of the engine. there almost always behind the balancer pully for the crank shaft

Seems like the fuel line looses its fuel or something. ????? That would cause a no start or hard start problem . Your best bet , have it diagnosed by a repair shop . That is unless you want 20 different answers on here . Are you willing to replace parts your vehicle doesn't need . Testing is the only way find the problem , not guessing , that's all you'll get on here . Hooking up a professional type scan tool an checking sensor data parameters to see what is a miss . Doing fuel pressure testing ,hooking up a pressure gauge .

007 Idle Speed Problems Scan Data for Idle

my sons car did the same thing there is a trans sensor ,that we just unplugged and works fine.(mechanic told us)

2004 Envoy xuv 6 cyl when I turn on the A/C the truck stalls but as long as I keep my foot on the gas it will continue to run

Throttle position sensor, check this out. Also try cleaning the throttle body with throttle body cleaner may be all it needs'

replace you intake air control (iac) valve right next to the throttle cable end two bolts hold it on and has two wire plug its about three inches long and round. hope this helps you.

Fuel filter clogged?

i dont know i am having a similar problem with my 91 olds cutlass calais its a 2.5 l 4 cyl and i can drive it and it only happens a couple times a week but the RPM gauge goes crazy and the car stalls out it starts right back up but when i put it back into either reverse or drive the rpm does same thing and car stalls ive had it to 5 mechanics they cant figure it out...im hoping to get help on here

I had the same exact problem on my 2004 Colorado (3.5L). Cleaned the MAF sensor (with MAF sensor cleaner) and throttle body/plate - cleared it right up.

change the saffty nutrol switch i take it front wheel drive if so right where the tran line up u will see a plug on the tran either 5 or 7 wire some time or or less wire