when i start my car in morning (or after its been sitting for like 6hrs) you need to give it gas around 2000rpm for about 10 seconds otherwise it would die right away. then once running if you do not let it warm up it will die if you put it in D,1,2 or R (nuetral won't stall). then once you get it goin if it is not completely warm, when you come to a stop as you slow down the rpm start trying to die, it will violently jerk untill it stalls or corrects itself. like a clutch when you stall)but this is an automatic tran though. My ECU is telling me i have a bad Engine coolant temp. sensor, speed sensor, and knock sensor. The starter was replace this month. any ideas guys?
PLEASE help

 

Check your idle speed but best bet is to get it to the dealer for warranty look.

your idle should be around 700-750...much lower and you can have the symptoms you described...idle adjust screw on ECU is same one used to check engine codes...

 

Check your fuel injectors. Do you smell gas when you try to start it? I have a 91 sentra that would do that and it turned out to be a bad injector.