ok the other day my truck was idling rough and running sloppy, bogging down and lacking power, so i tried to adjust that screw right next to where the intake pipe connects to the throttle body, because it smelled like it was running rich, wich turned into an epic fail, but on a good note, i relised the o ring on the screw was bad so i put a new one on. i got the truck to run decent, but when it gets to operating temperature it seems to misfire from multiple cylinders, so i was thinking its a warped intake manifold but then to make things weirder the truck wont start at all now, and it seems to be a fuel problem. the fuel pump runs so im guessing its the fuel filter, wich i replaced a month ago, but ive been runnin on empy alot and my tank has alot of rust in it. what do you guys think?

rough idle = vaccuumm leak
multiple misfire @operating temputare=poor timing, warped intake
no start due to fuel=bad fuel filter

i dont know where to start, each problem started within hours of eachother and it has me stumped. are they related or just a coincadence?

 

Might check the EGR valve, it may have stuck open.

 

k thanks, how do i come about checking the egr? is there a way to me it unstuck?

 

The Factory Service Manual (FSM) will have a test procedure. One simple thing to try is tapping on the valve and see if that will jiggle it closed. Might also have a bad vacuum connection to the valve or modulator.