Octane Adjustment Bar?

Is it an auto or manual? On manuals, just down shifting will usually eliminate knocking going up hills. Cleaning the entire intake system will help temporarily, but knocking will eventually come back. Your best bet is to up the octane if it gets really bad.

Here's the thing... i think your 92 probably had fuel injection not a carb, i know the 94 does. The reason people used to go to higher octane gas is because the carbs would get knocked out of whack and let too much air in, and a higher octane gas requires more air in the chamber to ignite the same amount of gas. on fuel injection cars, it is unusual for the air/gas mix ratio to get out of sync, but sometimes the injectors get clogged. I would first try cleaning the injectors and if that doesnt work look into getting them replaced. That's probably where your problem lies.