The 4.0 V6 can have injector problems and not be running on all cyclinders. You can pull one plug wire or injector connector one at a time witht hte engine running and see which cyclinders aren't running. The 4 cyclinder has two coils and one of them can stop working and it'll still run but lose alot of power pulling one plug wire off the coil pack and seeing the spark with it running they shoul all spark so if you find one the does'nt even though other wires are firing in the coil pack you have to repalace the whole thing to get it to work right. It this information does'nt help you or you check and find more troble add a comment and i'll help you somemore. I really need to know what engine you have and what country your in as these cars are built a litttle differently depending on the country they were built for.
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