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Top Tier is not a scheme. It's intended to burn cleaner and reduce emissions...epa thing. Way back when the car was new, fuel quality was really bad people were told to run premium mostly because it was likely to have detergent in it. Fuel got better so drivers advised to run MFR recommended...

Unplug MAF PCM should default to using TPS and MAP sensor values, will car go? What is fuel pressure? Do O2 sensors voltages vary? Air leak between MAF and manifold will cause low MAF readings. OBDII should show code or something.....Of course pcm and engine grounds are a constant source of...

81 had Baro sensor it went away in 83 I think. Baro reading is from MAP or Vacuum sensor at key on engine off prior to starting. MAP and VAC sensors are different in the voltage reading they send so you what to be sure you have the correct type. White wire problaly added by tech for some reason...

year would be helpfull. Check connector, power and ground to it. Chevrolet used MAF relay(s) on the V8s

Hello, new to owning a Corvette , 93 coupe, it's a fun car. Trying to get used to it's characteristics. "The coolest thing about a Corvette in the driveway is .....Knowing that it's yours"