Hi, I have an 85 4000S that appears to have a non-functioning OXS computer. I measure no current to the pressure regulator on the fuel distributor and read no supply voltage on the connector to the idle stabilizer valve. Hoping that it's not a bum computer, has anyone come across this; and is it something simple? My mom has an 85 5000S with, I think, the same problem. Thanks, dB