backround..... changed the plugs with oem champions around 5k miles ago, drove to and from florida recently with no reported ploblems.
last night i was driving home from nyc and while going through the pocono mtns my jeep was having problems on the up hills. at 65mph it would start to have a knocking sound and then shake like on rumble strips. i would lose a bit of power and the check engine light would quickly flash. i would coast down to around 55 and then it would allow me to go back up to 65 until the next up hill area and it would do the same thing again. eventually tried the hills at 55 and the same thing would happen. the jeep was fine at level ground, did 80 easily to pass a bus, but could not handle hills. the key dance brought up no codes but when i got home, my tuner showed me P0300 multiple cylinder misfires. anyone have any ideas? i dont want to start replacing a chain of parts that are going to cost me a ton of time and money. it needs to go to the dealer soon for scheduled transmission fluid and filter service but i am trying to save on their charges:thumbsup: thanks!
last night i was driving home from nyc and while going through the pocono mtns my jeep was having problems on the up hills. at 65mph it would start to have a knocking sound and then shake like on rumble strips. i would lose a bit of power and the check engine light would quickly flash. i would coast down to around 55 and then it would allow me to go back up to 65 until the next up hill area and it would do the same thing again. eventually tried the hills at 55 and the same thing would happen. the jeep was fine at level ground, did 80 easily to pass a bus, but could not handle hills. the key dance brought up no codes but when i got home, my tuner showed me P0300 multiple cylinder misfires. anyone have any ideas? i dont want to start replacing a chain of parts that are going to cost me a ton of time and money. it needs to go to the dealer soon for scheduled transmission fluid and filter service but i am trying to save on their charges:thumbsup: thanks!