Alright, so I bought a 94 ranger xl 4x4 4.0. Had to fix the trans cuz the kid screwed it up when he put the new clutch in. Now that that is fixed it Boggs down to around 350 400 rpm at idle and really Boggs while driving but after a few seconds it clears out. Checked the plugs, wires, tps, iac, and replaced the pcv since it was stuck open. The pcv helped a tad but It still does it. Also checked fuel pressure and have done a compression test all came back fine. I'm at a loss. Anyone got any ideas?

 

ok, after I initially made this post, I went and checked my dtcs found a bad ECT and o2 sensor. Replaced the ECT and the o2 sensor code end away. But now my idle and such is worse.... I can't hardly drive it now. Any ideas?

 

Welcome to the forum

Fuel injected engines use a controlled air leak to set idle RPMs, Ford calls theirs the IAC(idle air control) Valve

On the 1994 4.0l it will be on upper intake and looks like a can on its side, 2 bolts hold it on and it is a 2 wire connector

On cold start engine should idle up at 1,100rpm or so, then slowly drop as engine/coolant warms up
At full warm up manual trans engine should idle at 625rpm, +/- 5rpm, its pretty precise
If yours doesn't do the high idle cold then IAC Valve is not working

Good read here on cleaning IAC Valve: https://www.explorerforum.com/forums...-w-pics.84220/

You can test IAC valve when it is off
Turn on Key
Plug in IAC Valve 2 wire connector, you should see valve move inside, does move much but does move
Unplug wires and it should close, repeat as many times as you want to make sure valve is or is not moving, replace if not moving, also test the 2 wires with key on, should read 12volts(battery voltage)

 

the iac is working properly, but I just found out that my plugs are fouled. So I have to get new plugs before I can do anything else since it won't even idle right now. But thank you for the reply.