ok guys this what I have going on been trying to figure it out for awhile now. I seem to not be getting enough air my truck puffs black smoke when giving it gas to let say pass someone on the highway it will puff out smoke and clear up and go just fine but with a little lag. I have a blocker plate pvc reroute and 4 inch exhaust and the truck is set on stock right now. I did a boost leak test the other day by pumping air at 20psi to the hot side ic pipe and the only leak I could find was air coming out the back of the egr cooler where the blocker plate is. is there no gasket there only on the exhaust side. so my thinking is my egr valve is stuck open and im losing boost though the egr system. I did the test not long after it had been running but my thinking was the valve should be closed with the key off. just trying to get a idea if all this sounds right.