Back firing ( explosions in the exhaust) can be from fuel mixture too rich and unburnt fuel is getting to the hot exhaust
possible causes for that are excessive fuel pressure , leaking injectors ,leaking injector seals
backfiring through the inlet manifold can be calve timing, ---cam advance servo-- valve staying open ---valve clearance , problem hydraulic cam follower , incorrect firing order for the plug wires, crank/cam position sensors or wiring
IN this country there is a joke about jeeps
Santa was late with the presents because he bought a jeep
( jeep add about Santa buying a jeep released by jeep)
Don't send it to a scrap yard as there are people who can fix jeeps
SOURCE: Jeep Hesitates. P0303 code
Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.
SOURCE: 1998 Jeep Gr Cherokee 4.0
your problem seems to be electical,if so be the case change pickup coil if so equip.
SOURCE: 01 jeep Grand Cherokee transmission problem
Reboot system by disconnecting negative terminal on Battery, with ignition Key on and engine not running, remove terminal for more than two minutes and connect it back, it will spark a little do not panic, and try it again
SOURCE: I need a new driver door latch for my Jeep Cherokee
http://www.autopartswarehouse.com/search/?D=jeep+cherokee&Ntt=jeep+cherokee&Dx=mode+matchallpartial&Ntk=Main&Ntx=mode+matchallpartial&N=4294965318&Nty=1&V=1557&Vh=Jeep
Hope this works for you
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What size engine do you have? Is backfire out the exhust or intake? Also does it do it under a load or while idling or both?
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