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Look at 2 things. Replace the air filter ASAP. Check to make sure the air intake before the filter is not clogged. Also check the exhaust system and see if you have a bent pipe somewhere. A clogged catalytic converter is another possibility.

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Q: Why does your 91 corvette run bad and sounds like a vacuum cleaner sucking too much air at the throttle body to the hose to the air cleaner?
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