Quote Originally Posted by EagleMark View Post
In the 94 Silverado $0D with Vortec heads?
Yup. I had to add a lot of AE to get it to run right, and right now I'm at a compromise where it's too much in the summer and not enough in the winter. So the MAT should fix it in theory.

Right now I can watch my wideband be good on the throttle, let off to shift and it spikes rich (probably from the fuel being sucked off the intake walls) and when I get back in to the throttle after shifting it takes a few seconds to come back to stoich after going lean upon throttle reapply. I'm guessing fuel sticks to the walls again. On a hot day as I give it a little throttle to let out the clutch it will go rich on throttle apply and after a shift it will be a little rich on throttle apply too. It's a little better now with the thermac than it used to be, but still not good.