So when i take off my ranger stutters alot then it clears up but on the highway it can on go about 60mph on level surface.

i changed the fuel filter,the fuel pressure at idle is 35psi the truck has 130,000 miles and has a automatic transmission

 

Do you think it could be the transmission slipping or is it strictly the motor?

 

No its the motor tranny doesn't slip

 

Have you checked for a vacuum leak? On the later year models the 3.0 has a pcv hose running from the upper plenum to the pcv valve that has coolant lines around it and that hose is prone to split in the inside of the elbow causeing a massive vacuum leak. Don't know if yours is like that but if so it is something to look for.

 

well i did a smoke test and there werent any vaccum leaks...at school i pulled a couple codes they were high input tps sensor, air intake temp sensor,maf low input i think those were it but some how they got earased and i hope they willl come back up

 

A dirty or dysfunctional MAF will cause hesitation. You can take it apart and clean it but it is VERY sensitive. I had a Bird 3.8 with a spot not much bigger than this: _ about two layers high, and it threw a p0174/0171 code I think. Schmutz on the MAF.
Fuel pressure seems a bit low. What is the volume? Does removing the vacuum line from the regulator make the pressure come up? I think it should be over 40psi... and higher with the vacuum disconnected.
tom

 

Yes if I unplug the fuel regulator it goes up to 40psi....ill see if I can test fuel volume...but I remember when I did the fuel pressure test that as the rpms went up the pressure went down.

 

I think that is low. If you disconnect the vacuum line, the pressure should go up. Actually, the pressure should rise as the rpm's went up because the regulator is vacuum modulated. Intake manifold vacuum drops at high rpms and under higher load, thus the need for more fuel. Manifold vacuum rises at lower rpms and at idle, thus a lower load, thus less need for fuel, so lower the pressure with higher vacuum.
Does yours do all the above? I think unregulated is spozta be in the low 60's, but won't be my paycheck...
tom

 

I checked on alldata and it says 30-40psi is normal

 

Yes, regulated. Does it go up if you disable the vacuum line to the regulator? Does it deliver the volume alldata specifies? Fuel pressure gauges regularly have a 'relief' valve with a tube attached so you can measure volume delivered over time. You would, for example, run the pump for 10 seconds, catching the delivered fuel, and then multiply appropriately to determine if the pump is delivering the XX gph specified.
tom

 

is your truck shaking when ideling and when in overdrive does it shake? mines doin the exact same thing ive put a diff maf sensor and it seemed to help but im at a lose for wht to do to fix this

 

ok guys i fixed it i pulled acouple of the plugs out to find one of then to have carbon depositsd then tested the ohms on the wire and got nothing so i replaced all of the wires and now it runs great i was able to go 77mph up hill now insteed of 45mph