86 ranger 2.9 runs like crape

[RangerRich]

Hi I need help. I have a 86 ranger 4x4 W/2.9.My mileage has droped off from 20 to 15 mpg.It runs good up to 50 mph then craps out and no power.I have done a comp. tune-up.I have replace all the sensors,o2 and coil.I have cleaned the injectors and replace the fuel reg.it has 35 lbs fuel pressure and 15 lbs vacuum.I have checked the codes and wires to the TFI all looks good.Now I am going to replace the TFI.
Help RangerRich.

 

[MAKG]

You would think that before replacing some $400 in sensors, you'd spend $75 or so on some professional diagnosis....

No one will successfully diagnose your truck over the Internet, except perhaps by sheer coincidence.

This is over your head. And the scary thing is, it could easily be as simple as a $15 battery cable, poor timing, etc.

 

[RangerRich]

After spending $700 with ford and there diagnosis I was looking for some one that knows 86 Rangers.I did checked the timing it is set on 10*.I will check the cable.I will take all info you got.
Thanks RangerRich