I have a manual 4.0 ranger without egr. Dang truck idles good, no vacuum leaks. New wires and plugs. When I take off cold, the truck seems to bog down until I punch the throttle then it comes to life. After driving a couple of miles it's fine. No engine codes
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Clean your MAS (sensor right next to the air box) and replace you idler air control, the cylinder thing on the throttle body.
I did replace both. Runs alot better now, but I know have fuel pressure issues. After sitting a while, I have to crank a few times before it stays running. Fuel pump is running but pressure is low for the first couple of key cycles. Will be changing pump this week. Also replacing rotten fuel filler hose.
Just a simple trick I learned, remove 6 bolts holding the bed to the frame and lift the bed and use a jack to lift the bed up just enough to remove the fuel pump. Don't forget the filter (fuel filter) need to be replace.
