limited info, but id say its a crank sensor. turns over slow and choppy this could be your problem. turns over normal could be lack of spark or fuel. by turning over, i mean motor cranking but not starting. without more info its anyones guess.
Check the owner's manual.
Fuel pressure test.
The "Check engine" light will illuminate and a code will set.
There are many sensors that can trip the check engine light to come on.
Check and clean the MAF sensor.
Fuel pressure test.
it is the oil pressure sensor. Check your oil level, then test your oil pressure sensor.
check the plug to trans might of fallen off or broken
Check the vehicle speed sensor (VSS) located in the back side of the transfer case. Check all the fuses also.
O2 sensor circuit bank 1 sensor 2 no activity. Check the wiring and connections to bank 1 sensor 2 O2 sensor, if all looks good replace the sensor.
evaporator emission system pressure senser
Not necessarily.