I got offered to buy a 94 Ranger with the 3.0, it runs and drives fine with a few minor problems. But it needs a new spring for the throttle body. I've seached around for a replacement with no luck. Is this part replaceable or do I need to/ or should I replace the upper I take manifold since the throttle body is integrated in the intake.

The spring I'm talking about is in the center of the pic attached. The one the throttle arm pivots on.

 

Junk yard.

 

That's what I'd do too.

OP, your chances of finding that part for sale on its own are probably slim. Rock Auto may have something like that since their site allows you to narrow your search pretty specifically, but I don't know of too many places that might would carry that kind of part.