Test the circuit. Vacuum leaks are common anywhere other is a vacuum line. That's why I said use a vacuum gauge.

 

Ok I have another question ... should the test valve on my fuel rail always keep pressure? I notice after the truck sits for a few min there is nothing when I push the stem in? And my plugs are wet and smell like gas

 

It will slowly leak down when turned off. It should keep constant pressure while running.

 

I put a vac gauge on it idled at around 25 and when I accelerate the engine it drops to about 3 then goes back to around 25... I took the upper off and pulled injectors and checked for leaking ones and I found nothing... what now? Truck runs great with the egr disabled it's got me stumped

 

So today I was looking around and noticed the can lookin deal that the air pump goes into first is split and blowing air out.. any one know what that thing is so I can get one? Maybe this is some of my problem

 

U are talking about the air inlet box for the air pump,it could be a cause or a contributor,u can find them on any mid 80s to mid 90s trucks,

 

It should be sucking air in to it,if its blowing out air then its spinning the wrong way

 

Well it's like a black tube that's rounded on on both ends and has 2 tubes coming off of it one goes in the bottom from the outlet of the air pump the other runs to the diverter valve behind the upper intake mani

 

Do u have a repair manuel for it,it should tell u every thing u need to know

 

This is it!