i have a 2000 jeep cherokee sport and when i got it had been sitting for about 6-8 months. had to replace radiator cps and nss to get it running.it had a rough idle so i cleaned the mass air senosr and replaced tps and it helped a little bit but it will still jump into this mode where it will run really bad rough idle and when you floor it will accelerator really slow. but then if you shut off the jeep and start it again it will run like normal for a little bit till it jumps back into that mode of rough running.any ideas/help thanks

 

If possible, ask the previous owner about the Jeep going into limp mode. Maybe a search on here for 'limp mode 2000 Cherokee sport'. I'm not sure what issues cause that, but I've read a little about it here and it sounds like what you describe.

 

Compression test before you put any money in to it, and scan for codes.

 

did a compression test and all the cylinders are good.codes on the jeep right now are p1491,p0351,p1391