i have been reading some posts on the issues of loss of power and spit and sputter and backfiring. I have the same issue now on my 2000 cherokee 4.0. I have changed the coil pack, plugs and crankshaft sensor. it seems to idles better, but put it under a load and it does all the above things. I can get good revs with out a load, but as soon as its in gear, it goes bad again. I am at a loss right now. I have good fuel pressure and the motor was rebuilt 47000 miles ago, so i know the compression is up. any other suggestions will be appreciated. Also a BIG hello to all on here, i just joined