My car engine shuts off when i put in reverse.

The remote starter module is not getting an electrical signal when you turn the key to the on position after remote stating the vehicle. When you depress the brake without turning the key on the vehicle shuts down. The remote module thinks the key is off even when you turn it on. There is a loose connection or the remote start device is defective.

do you mean you changed the engine speed sensor for the auto box ? works off the engine rev's this is not on the same line as the rev counter it counts the rotations of the shaft spining.

sounds like your alt. is starting to go out and possibly a dead cell in the battery check to see if battery and alt. are working

The problem with it not starting and what you described is most likely caused by the battery cables. You should replace the whole cable from each post on the battery all the way to where it connects to the engine. The part about it dieing in reverse could be related to the loss of ground connections on the computer.

your idle could be set a little low, mine did that once. also you could be low on trans fluid or the trans brain and/or solenoid/s going bad.

Sounds like the shift cable has broken

What kind of car is it

Hi, have to checked to make sure there is PCV flow? I see you put in a new valve, but did you check it with the engine running? The hose or port may be clogged.

Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Change your fluid and filter and see if that helps,and put a can of lucas in it

I had this happen to me before. My battery had went out and I had put another in (didn't buy a new one-- it was holiday). It did this exact thing to me. The scary part is once, it was on the interstate going about 75 mph... didn't die but all gauges went to nothing. It turned out that the battery I was using didn't have enough cold cranking amps and was pulling down the alternator too much so the computer shut it down. The one time it didn't... it was because the RPH's were too high. Try checking the battery and alternator... make sure you have the right battery and have an alternator shop test your alternator if the battery is good.