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P0120 Throttle/Pedal Position Sensor/Switch A -Circuit Malfunction
P0121 Throttle/Pedal Position Sensor/Switch A -Circuit Range/Performance Problem
P0122 Throttle/Pedal Position Sensor/Switch A -Circuit Low Input
,try changing the throttle pedal switch/mechanism on the floor in the cabin
What your describing as bumper is the cowl over the actual bumper. The actual bumper will have sensitive air bag sensors. Before doing anything disconnect negative cable from battery. The bumper shroud or cowl should be in 2 pieces, the bottom piece removal should provide enough access. Usually held together with philips screws.
The first thing you should do is to check your air filter to see if it
is clogged. Locate your jeeps air filter and remove it. You will need to pop the clips off using a screw driver
to be able to open the top. Take a close look at
your air filter. Is it very dirty? If there is a lot of dirt on your
air filter then this is the likely cause of your problem. When your air
filter is dirty it will not allow enough air through to the engine
causing your air/fuel mixture to burn rich causing the black smoke.
can pick up a new air filter from any auto parts store. Once you have
your new air filter in place, replace the cover and reattach the clips.
your air filter is not dirty then your fuel injection system is where
we need to look next. One of your sensors could be bad. The sensors that
will be the most likely to cause black smoke is your Throttle Position
Sensor, Engine Coolant Temperature Sensor and/or The Mass Air Flow
Sensor. Typically black smoke indicates that the engine is getting too much fuel. Be sure they repair it before you purchase.
Hope this helps (remember to rating this answer and leave some testimonial).