Cherokee rough idle
I have a 97 Cherokee sport 4.0 and I am not entirely sure what is wrong with it. I should start by saying that I dont really drive it that much, only when it rains because I have a motorcycle that gets about triple the MPG. But since I hadnt been driving it that much I never put antifreeze in it when it started getting cold, i just kept regular water in it and a pretty bad cold spell swept through and the water froze and my dad was driving to a friends house when he said it started smoking and busted the lower radiator hose and quit on him. So he put on the hose and drove it home and we ran water through until all the air was out of the lines then put water and antifreeze in it but now it idles very rough, like shaking the jeep rough. And when the engines cold it will start right up but if i crank it and let it warm up then try to crank it again it doesnt want to start. Also when i come to a stop the revs shoot down to about 100-200 and it almost stalls. Also the heat doesnt work very well. About a year and a half ago i cracked the head on it and had to install a refurbished one and it was a pain to tear that engine down and im thinking maybe its a messed up valve or something or a broken vacuum line somewhere. Id really rather not rip the engine apart to find out it wasnt the head or valves or block. it sounds like a vacuum line to me but i wanted another opinion. Anyone have any thoughts?