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Heavily clogged air filters on any engine, hurt performance by reducing the engines efficiency. An engine is essentially an air pump, the easier it can breathe air in and out, the more optimal the performance will be. If the air filter element is restrictive due to being full of obtrusive particles you may notice a decrease in acceleration, a drop in MPG (Miles Per Gallon) or even stalling if it's bad enough.

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Q: What is the most likely effect of a blocked air filter on the operation of a ci engine?
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