91 ranger hesitates while driving

[ReadyRed85]

i have a 91 ranger it has the 3.0 vulcan engine in it it has a hesitation at al times when on the throttle i have replaced dam near everything under the hood i just so happened to check the fuel pressure which is supposed to be around 45psi if im not mistaken well that bastard pegged out on my fuel pressure gauge which reads up to a 100 psi so i figured hell what's one more part i went ahead and replaced the fuel pressure regulator thinking maybe the diaphragm may had ruptured and caused it to stay closed well the new regulator didn't change nothing I have been working on this for a while trying to figure out what is causing it. I have replaced the distributor cap rotor the toilet itself, plugs and wires, ignition control, module the fuel pressure regulator fuel pump and fuel filter. I've replaced all that stuff with new parts so I could really use some help or Intel from somebody that knows a bit more than me about it. I'm kind of stuck here. It would be much appreciated.

 

[Uncle Gump]

Did you verify fuel pressure with a different gauge?

Have you pulled codes?

Describe the hesitation...

Is fuel economy bad?

And I didn't know the 3.0L had a toilet...

 

[sgtsandman]

One thing to keep in mind with the quality of parts these days. New doesn't always mean good. Especially if it is an aftermarket part. On a 1991, you may have no other option. You may have properly diagnosed the problem but the new part was as bad as rhe one you replaced.