2000 Jeep Cherokee lean engine a hesitating

The car runs great, I do have some misfire but not even MODIS from snap on recognizes. The car starts reving up by up to 1200revs. then goes back to 650 615 revs. after that it starts to try not shutting off and if you dont accelerate it shuts off, if you do you feel when its not having a good combustion response, spark plugs look lean but I checked with my tech and he says 4.7 Jeeps tend to work with lean spark plugs, what do you think? any idea that can help? MAP, O2, PCV? ECM, TPS?
best regards,
Raul Molina