my check engine light came on the other day so i hooked up the scanner and it said p0304 P0307 and P0300 which are misfires on the cylinders. what in the world is the problem i recently changed spark plugs and the coil packs a month ago so what could be causing it to misfire

 

try a different (preferably brand name) gas, the station you got it from last time could have had some bad gas, or you could have dirty fuel injectors, you can run seafoam through the tank to help with that

 

they are brand new injectors so im going to get dry gas and fuel injector cleaner

 

tried all that still acting up

 

If you go to the first page, where it shows 1st and 2nd gen durango's. 17th line down i posted on how to perform three types of compression test. Do read it, it may help.

 

What plugs are you using and did you gap em?

 

autolites and i was told they were had a buddy do it

 

Maybe go to champions and gap them at .04 inches to diagnose the problem? HTH.

 

Change the spark plugs to Champion Copper Plugs gapped at .040 then go from there as Dan stated.