Here's the solution to my problem. Changed out the engine with a different used one. After putting it all back together again I had terrible acceleration. After taking it to a reliable mechanic he stated I needed a new fuel pump. Low fuel pressure. When I pulled the fuel pump from the tank I found that the return line hose had come loose inside from it's tube. Put it back on and the Cherokee runs like a dream. Praise God

Question extensively edited into written English.

The person who gave you 'terrible help' is a professional technician who services vehicles with electrical issues for a living. He can spot you are well out of your depth. I mean, it is a good job you changed the oil right? That might have fixed it?

Did you reset the security system and immobilizer after the battery was disconnected?

If the water pump is turned by the timing belt it probably was put back together out of time.

sometimes when engine jumps time it can cause the valves to get bent because engine is does not fire in order like it should.

Check your firing order

A common problem on these engines are the ignition coil packs, there is one for each cylinder, do you have any diagnostic code information so I can help diagnose the problem? The cat converter overheated due to the misfire.

The rest of those new plugs would be a good start. Also, did you replace the intake gasket again or just put it together correctly the second time?

the problem may have been as simple as a locked up alternator. Did you check too see if it was changed? The alternator will simulate a locked up engine. If an engine locks up you wont be able to get it running. The crank welds itself to the bearings or the rod locks up tigh. I suspect your engine was fine from the start.

Before putting any engine back together when doing head gaskets, it is always advisable to have the heads and block checked for warpage and cracks. (don't know if you did or not). Additionally, I try to find the fattest head gaskets available, to provide a bit more cushion. At the point you are at, You need to see if there is any coolant in the oil (likely), then try to find out which side it's coming from, so you don't have to remove both heads again.
Other option is to re-torque heads, going over factory value by about 5pounds, to see if the head will pull down. (possible but not definite)
Other option is to send it to the scrapyard...I have often noted that once overheated, those engines become a "rolling problem factory", therefore I would not think it was a terrible idea.
Or, you might want to experiment and try one of those exotic block sealers that are available...may be interesting to see if it works or not.
Sad part is that if the manufacturers would use a better grade of aluminum and put some zinc back into iron castings, most cracks and warpage could be held to a rarity...nice dream isn't it?
Good luck, whatever choice you make!!

Your problem is that you ran the engine without oil. In doing so, you damaged most (if not all) the bearings in the engine. There is nothing you can do to make this engine better except to do a complete rebuild. Bad bearings will result in extra internal friction. Thus engine will run terrible, probably knock, have less power, and use more gas.

not for long before u do some damage to ur motor