91 ram50 2.4 fires right up but falls on face 😕

Hey guys! Glad to see the forum is still alive and active! Been a while but with gas prices through the roof again and some other factors ive decided to jump back in to getting the old ram50 back on the road again.

A few years back when I was driving it pretty regular one weekend i had a little extra money and decided to give the ole girl some much needed regular maintenance so i went out and got all the basics, oil, filter, plugs, wires, cap and rotor, etc.. spent the weekend cleaning leaves out of various cavities, retaped some loose wire looms, replaced most of the little rubber hoses on the engine, washed and vacuumed,d of course changing the oil and stuff. After putting in the time and the money, and beaming with pride, my reward was a "crank but no start" situation that took roughly 18 months of piddling for an hour at a time, maybe a few hours a week to resolve 沈

Ended up being a bad fusible link that I had checked at least a dozen times 臘 but by that time I had created several NEW problems troubleshooting and let it set so long that i had rust in the tank and fuel pump issues. So here we are now, ive dropped and cleaned the tank replaced the pump and got everything back together (im pretty sure ) and now I've got a NEW one!

It starts right up, runs beautifully, for 5-10 seconds, then just stumbles and falls on it's face. Usually it will sit there and stumble indefinitely like it's dieseling until I turn it off but sometimes like in the video im going to link, it just dies. fuel pressure is perfect and steady..

https://drive.google.com/file/d/1xEc...w?usp=drivesdk

Any ideas?
Thanks!
Greg

Test compression
Check valve timing
Check ignition timing
Check spark
Check fuel delivery for lean or flooding condition
Check catalytic converter & exhaust system for blockage
Install a new PCV valve
Install a new air filter
With #1 cyl @TDC on compression stroke is distributor rotor pointing to #1 plug wire ?
Do all spark plugs fire at each wire outside the cylinder?
With engine running pull off one spark plug wire at a time ~ do all 4 cylinders react the same? Engine should idle on 3 cylinders, a bad cylinder will not cause any difference in idle with plug wire removed.
Test carb needle seat for leakage which will cause a flooding stall.
Test fuel pump for constant pressure & fuel flow
This should keep you busy for a while !!
Best of Luck

Opps your 1991 truck is fuel injected ? That is beyond my knowledge :shrug:

Before you start chasing ghosts, do an error code check from the ECU. The ECU itself may also be the culprit. The start but not idle issue is the clue...