I have a 1999 Chevy Cavalier with a auto trans...i just got done changing the motor and tranny and now i'm having a prob with it...when i start it and go to put it in drive it stalls. but when i unplug the big plugin in the front of the tranny i can shift it into drive and it will go but it will be in 2nd gear i have to wind up on the gas to get it to go any where and just doesnt shift. could this be a sensor?? or just a wire??? any info is great

 

Sounds like the Torque converter clutch switch is stuck in the on position. Meaning the tranny is in 4th gear the entire time its in gear. Just like a manual transmission, trying to pull away from 4th gear will make it stall. Common problems for these cars.
Reinstall the big plugin you removed, and d\c the 4 pin blue plug on the front of the trans. This is the plug for the switch. If you don't do a lot of highway driving, you can just leave it as is. the only thing you lose by leaving it d\c, is 4th gear. So you will burn a bit more gas as you will be in 3rd gear ll the time.

If you want it fixed, you should take it to a tranny shop and have them fix it as it get a little technical. If you bought the tranny from an auto recycler, or jobber, go to them and see if they will cover the repair.

 

Sounds like the clutch switch is stuck or something...

 

99 auto trans doesnt have a clutch switch??