stutters at deceleration- Help

[dyanz]

I have a g20 van 350 small block tbi. This engine sounds great but after accelerating you release gas peddle it decelerates to idle and then stutters and bogs almost dies but then keeps running. We have new plugs, wire set, cap and rotor, egr solonoid, replaced 2 tbi's. Checked map sensor, egr valve all good. What are we missing?? Can't figure out what is causing this. Seems occur when engine has warmed up to operating temperature.

[00Silverado4x4]

Fuel filter, fuel pressure? fuel pump?

[dyanz]

I have replaced fuel pump and filter. Not checked fuel pressure. thks

[00Silverado4x4]

There should also be a fuel pressure regulator as well in the system that may have gone bad.

[dyanz]

We cleaned and put new diaphragm in tbi. We are thinking that the egr valve is not working properly and not closing all the way. thanks.