When i start my explorer it don't idle right and stops

U will have to get the tps recalibrated

black smoke is the sign of a weak ignition and or timing

Could be a TPMS sensor or a MAP sensor. Check the fuel pressure to why u are at it. Cleanning the throttle body will be helpful also.If its been awhile i would check plug gap. To wide of a gap it wont fire like it should. A fuel filter is a plus also. Might be in the tank?

First, this "solution" assumes that the engine starts and runs OK, but will not idle once the key is returned to the RUN position.

A real common cause of that is the Idle Air Control Solenoid (IAC). To see if this is the problem, see if you can keep it running by stepping on the accelerator a little right when it is starting.

NOTE: you don't want to step on it before you start cranking the engine over or you will flood the engine. Also, step lightly, just enough to see if you can keep it "idling".

If you can keep the engine idling this way, then replace the IAC.

If this does not work, try unplugging the MAP Sensor and see if it will start and idle. If it continues to run (idle) with the MAP sensor unplugged, then replace the MAP sensor.

The next thing to suspect if none of the above works is the ignition switch. If it gets this far, post a comment to let me know and I'll post some instructions for testing the circuits for your ignition switch.

They put two different motors in the Explorer 4.0 overhead valve with vehicle Id code of( X) and the 4.0 single overhead Cam and a vehicle code of (E) If your vehicle has a E in the vehicle Id number I would replace the upper intake manifold gaskets. This particular Motor is very prone for the the upper Intake manifold gasket drying out and causing a large vacuum leak. The symptoms are engine will not Idle on dies on cold start up and after the engines reaches operating Temp idles fine .replace the upper intakes gaskets and I am sure you"ll be in great shape. Thanks for using fixya

sounds like the idle is set way too low on it.. there should be an idle screw on the trottle body.. just turn ut clock wise and it will slowly increase the idle rpm. make sure you do it in park though with the vehicle running. once it reaches 750 to 900 rpm stop and try it then it should stop dying..

does it start and run at idle in park.
it is probably either a vacuum leak or an idle air control valve,
if it misses and runs rough before it dies maybe a vacuum leak.
if it just idles too low, the iac valve

Sounds like the idle air control solenoid is either sticking or is bad. It will let the motor die when at a stop very easily. You need to have the ecu scanned for a code to verify this first before doing anything else. I have even had a situation where a bad tank of gas also caused this, a fill-up cured it right away. Hope any of this helps you.

ruff idle may b idle controll senc. ----tapping may be plugs-- wires, and or gas try 91 oct gas next 3 tanks and see thats the cheeepset place to start

check your EGR valve, make sure that it is not clogged and the valve can move smoothly