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Loss of performance or rough idle in 1986 Corvettes is often due to your Corvette Mass Air Flow (MAF) Sensors failure. Replace your failing Mass Air Flow Sensor with a new AC Delco unit. When replacing your Corvette Mass Air Flow (MAF) Sensor, replacement of both the Power Relay and Burnoff Relay is highly recommended. Without replacing these relays, you risk possible damage to your new Mass Air Flow Sensor, as well as continued engine trouble codes.