FATZ, I don't know too much about '97 GM's. I'm going to assume it has a device called an ECU that controls the fuel to oxygen ratio.
If so, you might want to give it a little while when switching between grades of gasoline. It can take these things at least a little time to "learn".
Of course I could be completely wrong about this. I've been driving Nissans since 1991.
If so, you might want to give it a little while when switching between grades of gasoline. It can take these things at least a little time to "learn".
Of course I could be completely wrong about this. I've been driving Nissans since 1991.