I have a '93 3.9L 4x4 and lately whenever i start it, it will take a few tries to start up nicely if it hasn't been ran in a few hours. It can start first try sometimes, but it'll idle very low. Like 200rpm. And the first few times i step on the gas, it'll bog down to about 200rmp and die if you don't let up on the gas. After driving for 10 minutes or so, it'll run perfectly.

I've replaced the TPS and Fuel Pump. Cleaned off the IAC with carb cleaner. Was told it had new injectors. Should i see if they put the wrong size injectors in? It definitely seems like a fuel problem to me.

 

did you inspect the condition of the IAC sensor when you had it out to check the spring and the length that the pintle was extended?? The only reason I ask is because they are SO problematic. It's not uncommon for the little spring inside to break, or for them to be bent, twisted, or just way out of adjustment. Also, did you check the MAP sensor and rest of the throttle body?? There's a small vacuum port on the TB for the MAP sensor and it can easily become plugged with crap. There's a way to test the sensor itself with a volt meter but I can't remember off the top of my head. A dead giveaway if it's real bad will be a lot of carbon coming from the exhaust pipe, especially if it's bad enough to the point it will stall the truck out

 

IAC seemed fine. Did not look at the vacuum lines to the MAP though. Will look at that in a little. It stalled while i was on lunch break ;P

Thank's for the reply