What we need to establish is the timing on this engine. The timing chain has stretched and jumped a few teeth. That ruins the relationship between the crankshaft/camshaft and distributer.
Same thing happens if the timing chain was not replaced properly.
I'm addressing this issue of yours as if I had this engine in my garage and I was doping out the problem. So why hit you with all the possible problems I might think of and possible fixes there might be. It could get very confusing for all of us.
"Taking care of our veterans is a cost of war. If you can spend six trillion dollars sending people to war, you can spend a few billion dollars taking care of them when they come home"
Sen. Bernie Sanders (I-Vt.)
If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!