ok my truck ran like crap
then i replaced the cap and rotor and it ran great for 2 days now it is doing crappy again
plugs are in good condition i gapped all at 0.40 i know the alternator is good because it shows it is charging .

what do you guys think ? coil, PCM , IAC ,MAP sensor
i am going crazy trying to figure this out HELP ME !!!!!

 

check out the coil first... and you did wires too right?

 

not the wires
i think i am gonna do the coil , wires, plugs.
this is still the coil that came on the the truck 67,600 miles ago
how do you test a coil ? if there is a way