You need a scan tool to properly diagnose your no spark issue. You need to be able to see if the PCM is getting a CKP (crankshaft position AKA RPM) and CMP (Camshaft position) signal. I don't know on a Jeep for sure, but most vehicles when they loose CMP signal, they stop dead in their tracks, or will not restart after being shut off. GM 3.8 is one exception to that rule. 9 out of 10 PCM's replaced have no problems. Without a scan tool, you could spend a bunch of money hanging parts, and never get it fixed.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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