I have low idle and continual multiple misfire codes on #2 and #4 cylinders. Iv'e swapped, then replaced coil packs with same results. Stripped down vac system and canister, cleaned everything I can get to with cleaner and air blow gun, flush injectors out, new plugs, PCV clean, vac lines in good condition. I can't seem to narrow this down... However, This baby drinks and burns oil, I'm wondering if compression isn't too far gone! Runs great down the highway though.....
Check oil every day
SOURCE: 2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.
having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,
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