My 302 in my F-150 has some issues. seems to have hesitation almost miss when cruising down highway in O/D or just drive. no real codes. its a Maps 302. how do you test wether coil is still good. spark seems weak. sometimes it stalls and will not fire by cranking it over unless you hold gas pedal on floor. perhaps flooding but i don't know how to check if injectors are leaking. i always get a rich code. i did install a new o2 sensor. now a little info on the truck. I have a computer friendly comp cam. i have shorty headers and off road h-pipe. it does smell rich.