 1987 f150 problem rough idle/hesitation/stalling.
I just bought a 1987 f150 with 110000 OM(so the previous owner reported.)
When i got it like 2 weeks ago it was running great. The last couple days i've been having some problems though. The idle seems to be real rough. Also sometimes the truck will bog when accelerating as if it's not getting the correct amount of fuel. Also today i got to work and put the car into park. All the sudden, the engine starts revving VERY high. I put it into reverse and it went back to normal. Then back to park and it idled ok.
I'm not a huge mechanical guy, but my thoughts were:
-fuel pump(s)(the truck has 2 tanks one i know has a bad pump; The other one was supposedly fixed like 6 months prior to me buying it.
-Fuel injector(the previous owner told me 1987 was the first year they started putting fuel injection in these trucks.) i hope this is not the problem
-Some kind of throttle controlling element.
-I also read some other posts saying it could be a vacuum problem.
Thoughts? Advice? Suggestions? please help me!
thanks in advance.
-Prim | 
