i am stumped on 2000 Mercury Villager

van has a 3.3l eng
run fine til eng warms up the dies and wont star til it cools down. replaced dist. didnt fix it. crank sensor didnt fix it . saw the issue with the inj. from this site so i check two one had 15.5 ohnms resistance let van warm up till it stoped running the pulled intake to check rear inj. by the time i got to it the eng had cooled off check #5 inj. had 17.5 ohms ressitance heated it up with heat gun and the resistance rose to 33.4 in about 3 min. (great theres the problem) replace all inj. and now it runs like it is out of time if you can keep it running cyls 2,3, and 4 are like there dead but have ign fire and noid lite flashes for inj pulse. spray staryting fluid in it still runs the same fire orders is correct. fuel pressure good .
im out of ideas

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2 answers
it could be ignition coil
Are you very certain that the fuel pressure is good at the time the problem occurs? Do you verify fuel pressure does not bleed down?