96 ranger rough idle
i bought this ranger about a month ago and everything i have done still dont fix the prob, it will idle fine then about 5mins or so the idle drops and misses and runs rough but if i hit the gas it dont have a miss at all and runs smooth until i let off the gas again. Ive changed spark plugs, wires idle air control sensor? there is no vacume leaks either i already checked, Ive noticed when i unplug the front coil pack it runs rough even sounds like a miss i plug it back in and it runs alittle better but when i unplug the back coil pack it just drops idle alttle bit no big difference so im wondering if my back coil pack is bad. i have good compression did a fuel pressure test it passed it even alittle high but normal, new air filter cleaned the maf, im just stomped by what it could be.