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Hello everyone, just a problem post to see if anyone can help, I'm having an issue with my car, to start with I fitted some tunner stage 3 cams with all the upgrades needed, the car ran great after tunning for a couple off weeks then it started with a miss fire after an lma snapped, so the head came back off,skimmed the head had it port polished and replaced all lma's with brand new ones, I then put the head back together and started it up for the first time after everything and the miss fire was still there but the car drove a pulled brill after 2500rpm, so I did a compression test,I then stripped the engine completely and replaced piston rings,bearings on the conrods, timming chain and tensioner,basically an overhaul, started it up for the first time again,it ran sweet for about 10secs then I heard the same noise from when the first lma snapped and it started to miss again,so switched it off straight away and took the rocker off and everything was good,engine turns over brilliant so we did a compression test again and on a cold engine all for cylinders where at 180psi so put it back together, miss fire is still there only ever so small, I took the car up the road and as before it clears at 2500. I've swapped all coil packs around and injectors and it seems to stay on cylinder 3 no matter what I do, I'm realy stumped and don't know where to go from here,any suggestions by you guys,thanks