Yes, I have a 97' land rover discovery, and I would like to know what is the name of the part in the picture, and what functions does it have, and also the fuel temperature sensor. I would really appreciated if you can response as soon as possible. Thanks

The problem that I experiencing is when I start the truck it begins to tremble as if it wants to stay on and a little bit of smoke but as soon as I release the gas the truck will turn off. I believe that is not burning the fuel right, but i want to know if it could be something else that I have not thought of.
or this 2 sensors the one in the picture or the fuel temperature sensor

 

Pull that black cover off that's screwed to the fender to the left in your picture, I believe that's your ECU (computor)

It belongs under the cover.

luck,greg

 

What color is the smoke?
What have you tried so far?
When was the last time the truck had a tune up?
Is the check engine light on and if so have you had the codes read yet?

A bad fuel temp sensor can cause a hard to start when hot issue or a stalling while hot and in gear issue.
Not running at idle could be any number of things, like the idle air control valve or really dirty spark plugs.

 

the part you have circled is a fuel pump relay

 

MY BAD - I got off my lazy butt this am & looked at mine, I didn't remember it being tucked in there.

luck,greg

 

I just changed spark plugs (bosch) three weeks ago and had an oil change. Let me explain to you better when I take off about 30mph it runs smoothly but as soon I get to a complete stop it starts trembling releasing gray smoke and after of couple of seconds it turns off. The check engine light is not on because I was changing the alternator and I needed to disconnected the battery so I reset it, but before like 2 weeks ago I got 2 codes one for oxygen sensors, and the other one for the fuel temperature sensor. Could it be one of those two? I haven't replace them but it wasn't doing that before I change the alternator.