Hi my cherokee is a 2001 I6 engine and has misfired on me 4 times since i bought it in january and my dad and i thi k its vapor in the injectors how cam i fix it it happens when i run it hot. Meaning say i go get a cup of coffee on a hot day then itll misfire when i go to start it and contuine to misfire any way i can fix this

 

Start with new spark plugs and running injector cleaner through the gas tank. I recommend BG44K as injector cleaner. It's a little harder to find than a product like Lucas but it works much better. It'll be worth the search

 

There is a TSB about installing heat shields around the injectors to try and keep the fuel from boiling in the injectors. There is also some talk that the valves may not be sealing intermittently and causing misfires. Cycle the key a few times before starting and see if anything changes.

 

where can iget head sheilds and injector cleaner

 

Get the valve cleaner from the dealer. I've had good results with it. First time I bought it they told me to dump it in the throttle body while running till it dies and let it sit over night.
Next day run it hard and the valves should clean up and seal a lot better.
As for heat shields I just made those outta tin.

 

Run till it dies? You mean run it till i run out of gas? And can i order the cleaner online caz otherwise ill have to drive an hr away for it

 

No! Poor the stuff in while running till it stalls then turn the key off to save battery. Not till its outta gas.. If it don't stall after there's no valve cleaner left then shut it off.

 

Ok thanks

 

And its been cylinder 6 up aganist the fire wall every time anyone have a clue why?