I ditched my computer, and lost fuel mileage, does anyone know if ther is an aftermarket egr controller, or older egr that will help me to retain my highway mileage ? ------------------ '87 Z-28 305,Edelbrock 600 cfm, stock 700-r4 terribly slow

Not that I think it'll help you with your fuel milage....

But you'll want to get a Thermal Vacuum switch, and an EGR that will bolt to your intake.

I have used the "universal" ones before, but you may need to get a specific year for clearance issues. Start eith something like a '78 V8 Camaro..

Anyway, plumb ported vacuum to the Thermal Switch, the other side to the EGR valve.

This way you'll never get EGR at idle (via ported/timed vac) and only when the temps get's up to the Themal vac switches set point.