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I would unplug mass air flow sensor and see if it stays running...will run a little rough, but if it changes and keeps it from dieing then, mass air flow is most likely bad..could be fuel related, several things, but that is a simple starting point..
Can you provide some more info...is it driveable? If so does it have a bad miss, or what happens if you try to drive?
The "won't rev" part sounds like a preventative so you won't destroy the engine from cold start-up. The sluggish part sounds like bad fuel or spark plugs. Where do you buy your fuel and what octane is it? and have you Changed your plugs?
ok i have a 1998 durango with the 5.2L 318 engine. had trouble with a bad cell in my battery. I went out bought an optima red top battery for it 800cca. put it in and had same trouble. No start without putting foot on gas. wouldn't stay running without holding foot on gas. CPU has to relearn it's programming once you unplug it for long periods of time. mine was without power for about 2-3 weeks till i got new battery. Start with this.. first check under air filter make sure a squirrel hasn't made a mess under your air filter and it's clogging the air intake. Then pull off the lid to your injector cover ( the screw down lid coming from the air box ( with air filter in it) to "carb") make sure all your cables move freely. put that all back together and close hood. Start truck with foot slightly on gas pedal to get started. keep it at about 1k to 1500 rpm for about 1-2 minutes. Rev motor to about 2500rpm and let it die out if it will. Get out lock doors with key fob if you have it. if not make sure to lock doors. ( trust me it worked for me) let sit for 5 minutes. come back out and unlock door and relock door 3 times with fob ( if you have it ) or key if you don't have a fob. Then unlock it with the key and enter vehicle. Start truck as before and keep it around 1k to 1500 rpm again for about 30 seconds rev it up and should keep running. Mine did. I think the iac was stuck from sitting and has now since loosened up. Good luck hope ti works for you.
check fuel pressure, should be 40 psi.
try 2 things
spray starting fluid in air intake to see if it will stay running. It's fue then.
Try turning key to on nd wait 5 seconds for system to build pressure and pump to shut off. Turn key off, wait for relay clcik noise or 10 seconds. then turn key to ON again and wait 5 seconds to build pressure again. Then start engine. If it starts better, you have a bad check valve in the fuel pump or a bad pressure regulator on the fuel rail (unlikely).
Problem is not solved but I did change the fuel filter, coil pack,ICM and have proper fuel pressure to the motor. Car starts but dies right away. I cant seem to find out if the fob on the key ring has something to do with stopping the motor. This fob says Radio Key by Secure Key with a number 35077 stamped on this thing.. Still trying to find out what this is and does it effect the cars ability to run
try checkin your idle air control. most of the time it is a vacuumn line going into intake.pull it off and if the car revs up dont worry, it wont hurt it. if it does simply put it back on, if it dies you have a bad vacumn.
Are you certain that its a fuel delivery problem? Since it DOES start and then Dies...i would look into "Cold Starting" problems.. Like a Coolant Temperature Sensor -- it acts like a choke for these newer cars. Next time you start it...rev the engine and try to keep it running for a few minutes.....see if it stays running after you get the engine warmed up....if it DOES stay running...then thats the problem. Otherwise try to get the trouble codes from the OBD2. you can usually rent or borrow them from your local Auto parts stores. Keep me posted and i can help you figure this one out.
Sounds like a large vacuum leak,low fuel pressure,fuel pressure regulator failure, idle air control valve stuck open,plugged fuel filter.Also check for good consistent blue spark at spark plugs or jumped timing chain.Hope this helps!