My 1993 Ford Ranger 3.0l v6 manual is finally put back together and I got it running but I noticed the engine is running really rough shaking the block and gear shifter and while I’m driving it will just stall the most recent was when I put it in neutral, I suspected it to be the idle air valve so I replaced it but it’s having some weird throttle issues and idle issues still. What should I do to diagnose and fix it?

Parts I changed:
Valve Stem Seals
Spark Plugs
Spark Plug Wires
PCV Valve
IAC Valve and Gasket
Valve Cover Gaskets
Upper Intake Manifold Gasket

(I know the IAC Valve I got has a adjuster screw but I have no idea how to properly set it)