this motor just causes a ruckus idling, its loud and clangy like lifter slap or maybe a loose timing chain hitting against a bad timing tensioner?? i don't know, it runs great when going, pulls decent as a 2.5L will. but when idling it just sounds like crap. it has 333,000 on the odometer, previous owner said he got it from a dealership who said that the guy that sold it to them had a newer engine put in, but its still a tbi 2.5L, so i think this is a lie, but i have wire connections that lead nowhere all around the engine bay. its like I'm missing tons of connections but i have no idea what theyre for, tried tracking them down and I'm a decent electrician and have worked on many 4.0L cherokees so i figured the harness couldnt be too different for this comanches 2.5L. i mean even the wire w/ plug coming out of the distributor doesnt have anything to attach to, how does this work? how can the timing advance during higher rpms with no input from the computer or anything? also its not blowing out any heat, only outside air temperature through the vents or windshield, so i know i have vaccuum and its okay in that department but I'm not getting heat. what could this be? thanks for any input guys
here's the truck: