I have a 2002 slt dakota with a brand new remanufactured 4.7l I've installed with that i upgraded a few things like bored out throttle body, cold air intake, copper racing spark plugs, all brand new sensors, new water pump, clutch fan that attaches to water pump, bigger fuel injectors. And after all that finally got installed it fires up for 1-2 seconds and shuts off I've closely inspected the engine for any leaks none to be seen anywhere i checked my vacuum lines all good there .my scanner says no dtc codes. Any ideas? Im at a loss.

 

Is the security light in the dash on? Got a chip in the key? Sounds like some variety of anti-theft system is biting you.

 

agreed, sounds like SKIM.

Less likely, the IAC may need to learn counts, requiring idle-by-foot.

 

No security lights i dont have a chip key or any other lights on dash

 

Are the new sensors all Mopar/Dodge ?

 

Not all of them i ordered them from rockauto.com and they are mostly "performance" but some only had "daily driver" option but not anything from the cheaper economical stuff.

 

I'd try the correct sensors on it [especially Iac,tps,cps,css an 02. ]since these are very picky on the off brand sensor/pcm signals .
An be sure it's not sending a signal to the auto shut down relay directly after started.


Read link.or scroll down past reply @related threads ..-"You must change the computer if you change the injector size"
Bigger injectors/pcm fuel ratio delivery .

bosch fuel injectors for my 3.9 - DodgeForum.com https://dodgeforum.com/forum/2nd-gen-dakota-tech/106471-bosch-fuel-injectors-for-my-3-9-a.html

 

Do you have a black key, not a green or gray key?