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.
Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!