95 Toyota 3.0
At idle seems fine but around 1800-2000 seems to sputter and run rough. I'm questioning the fuel pressure regulator but I want to hear what others say about the symptoms when they fail? I haven't dealt with too many failed regulators..

 

This will get you started. No sense in guessing, or throwing parts at it until we've tested things.

Get a hold of a factory service manual for info on how to properly test.