i keep getting a 2 and 4 misfire at random. it will come on at any time. high rpm, low, in the middle of shifts, or at an idle. it will turn off after 10 key cycles and sometimes stay off for a few days to a week. or a few minutes. my plugs are fairly new, coilpacks are alright, same with compression. i dont think it would be my injectors, cause if it was wouldnt it be a steady misfire? possible fuel pressure regulator? my fp sits at about 42.5 at an idle which is a bit high or pump? im stuck.