Does anyone have a understanding of the mechanical end of the EGR system in a Vortec Engine? It's a 98 but I think mechanically 96-00 are all the same.

I'm wondering if there is a possibility of it feeding one bank more then the other? Or could something get plugged?

Why? Well I have my tune dialed in for fueling, did so with WB in Open Loop and EGR off. Back to Closed Loop fueling is still spot on. With EGR enabled Bank 1 STFT/LTFT is off by about 3.1% all the time EGR is on.

Side topic: I'm wondering if the EGR being on from 3 MPH is hurting my around town mileage? My understanding and testing shows EGR to give better mileage on highway for sure! But it does produce less HP, so why would I want it on when HP/Torque is most important? From a standstill it is on at 3 MPH with a varying % based on TPS, more TPS = higher EGR%. I'm thinking this would hurt mileage? Maybe turn it on at 25 after vehicle has made it up to speed and HP/torque requirements are much lower...