JeepPower

Yesterday when driving up hill on a highway at around 80km/h the Jeep started to jerk or buck. I gave it more throttle and the engine light started to flashed 2 or 3 times. When I reached level ground everything was back to normal. This is the 3rd time this has happened. First I noticed it back in the winter and now twice this summer on the same stretch of highway. I came home and pulled a P 0302 code by turning the ignition 3 times on/off. This is a misfire in cylinder two from what I read.

I have also read it could be anything from bad valves to transmission issues. I did install new plugs after the second time it happened this summer but it didn't help. What else can I do?

My Liberty is a 2005 LE and has 109000km on it.

Ryan09

You need new stock NGK copper core spark plugs!

LibertyTC

Switch coil pack from another cylinder and see if the code moves as well.
I also use NGK copper core plugs and replace them every 25k miles.
Also to be on the safe side, have your battery load tested.