I think that I have a bad EGR and I was wondering what symptoms you had. My 2.5 idles rough when it does idle and it seems to lack alot of power in the low range. I think that I have a bad EGR. Yea I have checked every thing else.
92 S-10 Blazer 4x4 Vortec 4.3
85 S-15 Pickup 4x4 2.5 iron duke