Dads basically a mechanic so the toolbox is big, we might take it to someone so they can check it out, the car has around 130,000 Miles on it, I do have random coolant loss but the coolant system has had problems before and we think one of the aftermarket parts don't seal well which cause a leak. I would rather not touch the fuel injectors YET but we have put injector cleaner and octane booster which did not fix anything, also could the fuel injectors have anything to do with Misfire when cold but works fine hot? I mean the car pulls when I give it gas on the freeway. also, can I just check compression the traditional way or is it different on these engines? What's a good PSI for N62? coils are mixed bosch and some aftermarket ones (cylinder 2 is bosch) spark plugs I do not know but I also swapped them and it's still misfiring the same cylinder. I do hear weird sounds when my windows are down and idle next to a car (sound bouncing off other cars) i don't wanna cheap out but I would like to save money because this car has other problems that need to be fixed.