dodge durango 2000 wont start.

Ok. I have a 2000 dodge durango, dont laugh, 4.7 liter, v8. after a bad oil
change in which they only added one quart, charged for 5 and I drove it for
250 mils till dry. added 5 quarts, drove weird. checked oil for leaks, the bad
kind, not peanut butter. drove for 2 weeks. driving weird. felt engine rocking
and almost sounded like misfiring. no stalling. no start up problems. then
after cutting off for 20 minutes and returning to it. it didnt start. I mean it
tries to, sounds like my jeep did when I had to pump ro get her to start. tries
to start but doesnt. took off air intakes, plugged with hand. started fine
once....ran good for about 15 min then stalled. now it didnt start again. tried
same trick, nothing. ook off fuel plug to see if getting feul. was squriting. ok
not gas pump then.OK might be sensors. both on side of air intake.
replaved both, idle controll and air intake sensor. nothing. might be sparks.
reaplved all 8 coil packs and sparks. nothing. tries to start but cant. took off
air flow again tried first trick. nothing. took of that plug again. this time
nothing squirted. pumped alot. still nothing. checked all fuses none out.
Next step is gas pump or fuel injectors. help me???? what else could it be?
ive already spent 1000 on it...then 350 on water pump, barrings,
thermistate. sensors and coil packs and sparks..... plus all new tires and
paint job....is it worth more???? could it be something simple????