Ok so kinda like the title says ive been getting a cyl 3 misfire so heres what I've done so far..switched coil packs, brand new factory plugs, and compression tested 160psi accross the board. still did it under load around 5k rpm. Took to the dealer and they replaced the injector. Here's where it gets interesting..drove home and started misfiring instantly and car felt like crap. Kept flooring it and deleting the codes with acess port. And then all the sudden had great power and car stop misfiring. so decided to do a 1st through 4th pull and 5k in 4th boo misfire cyl 3. So car still misfires but now i have to beat on it more to get it to do it. does the dme need to learn off the get go? Or should i take back to dealer and have them mess with it? What else could it be? Dirty valves? Also on a side note I have a new hpfp too.
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