Looking for the size of the inlet opening for the EGR valve on a 1985 Mustang GT 5.0 with the High Altitude system. Also does anyone know what the P/N of the stock EGR valve. The decal is long gone on mine and I'm chasing down a slight low engine surge at light throttle in all gears. When surging if I give it just a bit more throttle the surge stops for just a second and then returns. Thanks.
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