2001 jeep rough idle when started - 2001 Jeep Grand Cherokee

If the "Check Engine" light is on, have someone get the OBDII codes with an OBDII scan tool. If not, check the plugs, distributor, plug wires, timing chain, and compression.

check the O2 sensors in the exhaust manifold with a automotive meter not a code reader ,then trade it in for a diesel manual version as these are impressive but 4.7 litre gas guzler at our petrol prices about 10 dollars a gallon in the -uk and around 7/8 dollars here in spain this vehicle you couldnt give away here

SOUND LIKE INTAKE MANIFOLD VACUUM LEAK OR VACUUM HOSES VACUUM LEAK.ALSO DIRTY FUEL INJECTORS WILL CAUSE THAT PROBLEM YOU DESCRIBE.

you check for miss how is compression

fuel pump or ignition module

if its an inline 6 check the intake manifold bolts...they can vibrate loose and make the engine idle rough because its sucking excess air

Battery should be around 12V the alternator puts out 14V. Sounds like a fuel problem, leaking injectors or injector's O-rings. Weak or faulty fuel pump, clogged fuel filter, faulty fuel regulator. Try this, when starting the car while cold. Put the key all the way to the ON position, wait five to ten seconds then crank the car to start. It should start the first time the longer you give it the more fuel pressure there will be to start the car.

It sounds like its out of time move the distriutor a little bit

Timing belt could have skipped a tooth.

Horrible vacuum leak could have started. Listen for suction noises when you raise the hood.

Someone could have poured sugar in your tank.

You could have put diesel in your tank instead of gas.

Could be a bad MAP sensor, TPS sensor, etc.

Need more details to be precise.

warped heads will cause this...if it over heated badly thats going to be the problem