If you're talking about the resistor that plugs into the harness where the MAF sensor did, then that would'nt be why the car is not running right. All that resistor does is fake out the ECU into thinking the MAF sensor is connected so you don't get the "!" and check engine light. BUT, make sure the resistor is connected right. Looking at the pins of the MAF connector with the rectangle notch facing up, the resistor goes across the second and third pin from the right.
If you're saying it was fine last week, then you installed something that didn't interface to the VPC and something is now wrong? Anyway, remove the Rev meter (if you don't see anything else obviously wrong) and put it back the way it was.
VPCRed --Supra ECU A-31
VPCBlack --Supra ECU B-69
VPCYellow-- Supra ECU Fuel comp back to B-66
VPCWhite --Supra ECU B-58
If you're saying it was fine last week, then you installed something that didn't interface to the VPC and something is now wrong? Anyway, remove the Rev meter (if you don't see anything else obviously wrong) and put it back the way it was.
VPCRed --Supra ECU A-31
VPCBlack --Supra ECU B-69
VPCYellow-- Supra ECU Fuel comp back to B-66
VPCWhite --Supra ECU B-58