http://www.cygnusx1.net/supra/librar...fi/FI_117.html
vsv switch egr underside of the intake near the back there is one for fuel also worth looking at simple test determines if it's shot with an ohm meter to check continuity .
i replaced a lot of stuff getting to this one part that was toast
as soon as i replaced the egr vsv my mixture was good .
i thought oxygen sensor , cold start injector , cold start switch but the vsv did it