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P0300 301 304 305 306 2008 bmw
car had a weird rpm fluctuate, it would go up and down, so when i bought the car i replaced the valve cover, spark plugs, ignition coils, i checked 4 of the 6 injectors they all seem to be spraying good, i put ebay bosche spark plugs in, and random ignition coils, is there any other diag work i can do before ordering different ignition coils? this was supposed to be a cheap A-B work vehicle,im not sure what else to diag or replace. but car runs like crap with the misfire on startup the rpms will just go up and down like 500-1k back down to 1k i believe.
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