I have a 95 1500 4x4 with a 5.2. lately when i am driving the truck with start bucking. if i let it idle the rpm are surging up and down, i noticed that my cruise control has stopped working and it always worked beofre. and my fuel mileage has dropped. but it is not a constant problem it doesn't act this way right away, but once it starts it won't stop until you shut off the truck.
I am thinking it could be the fuel pump, computer or the intake.
any ideas? any help?

 

Well you might want to give the truck a full tune up air cleaner, plugs, wires, cap, rotor, and pcv valve and i believe that you can reset your pcm extremely easy by disconnecting the battery for 15 minutes then reconnect it.... it might run wierd right away but let it idle for a little bit but then it should be all rite.... give it a try

 

Today i finally got a code
code 51
it says that it is running too lean.
i guess next is to check the fuel pressure and check for vaccuum leaks.

Any ideas to what could cause this?
What should the fuel presure be?
What should the vaccuum read?

 

Fuel pressure should be 50 psi according to my Haynes manual and I pull about 20" of vacuum at idle.


Jonah