I did a compression test on my 91 v6 and the results are 177, 177, 172, 177, 177, 177. I did this test because thats what everybody said to do first. My 91 dies when the weather gets warm. It dies when I stop at redlights or cut it off, wait 10 min and start it; it will die 5 secs. later. Im going to look into the fuel pump next. I have already changed the fuel filter.

 

There is nothing wrong with those results at all. In fact thats a pretty tight motor.

 

looks REAL good!! If you had one or more in the 160 range that would not good, but when they are all similar you're ok.

 

As long as it doesn't have a 14 psi varience it's fine those are great #'s concidering it's supposed to be 172 psi according to the chiltons manual.
Are those compression #'s cold or warm #'s? because you have to do both to determine if it is a ring issue.
Here are some things to check:

Check the fuel rails or lines for leaks also have you tuned it up or anything lately?
Air problem like somewhere in the intake or the air intake hoses or a fuel issue like possibly bad injectors?
Have you done a fuel pressure check yet? That will rule out bad fuel pump.
Also pull your distributor check the cap and rotor and check the rotor shaft for play if there is any replace the distributor.

Goodluck

 

Those are fantastic numbers.....you might even check the 172 psi again to ensure you had a good seal when you did it. Otherwise I wouldnčt worry about that in the least.

 

Im not sure exactly how to check the fuel pressure for the pump.

 

when the truck stalls what does it sound like when you try to start it??? I have seen the fuel system vapor lock in warm weather. My buddy truck had a bad cat once it warm up the truck would stall and it would take 10 min to restart.

 

It starts up ;ike normal, but then shakes and dies.

 

When I checked mine, we screwed the fuel pressure guage into the fuel rail right by the fuel pressure regulator. Then when we revved it up we could see the fuel pressure spike.