Need help troubleshooting misfiring

[Jack15379]

I got an 89 4.0 that’s been missfiring and stalling. It started out missing and joulting when accelerating hard in first and second gear but the other day it sputtered and died right after I started it up. It will start smoothly cold but after a minute or two it begins to sputter and miss and stalls. It’s hard to start after that and if I do get it going it’s missing all over the place. Exhaust smells like gas and it backfires after a couple times restarting it. I’ve replaced plugs, distributor cap and rotor and wires and have a crank position sensor ordered. I believe it’s some electric ignition issue due to the rich misfiring but don’t really know where to go from there. If anyone has any of what the problem could be or how I can identify it I’m all ears. 

[Pete M]

could be a bad sensor.  the link in my sig has a few threads with diagnostic methods for them.  

 

have you run through Cruiser's MJ tips yet?  that should be like the first link.

[cruiser54]

Tips 1,3,4 and 5 before doing anything else. 

 

Make sure your intake manifold bolts haven't loosened up and the vacuum line from the throttle body to MAP sensor on the firewall isn't cracked, melted, split.