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Q: acceleration problems on 1999 Toyota Corolla

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Whenever I accelerate the engine sounds loud, like an outboard motor, and it seems a little slow to accelerate. What is the problem?
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From your description it sounds like you may have a restricted exhaust system. This is not always a cut and dry diagnosis. Sometimes the only way to verify that it is a restricted exhaust is to disconnect part of the exhaust system and see if the symptoms have changed. Some muffler shops have cheaper techniques to test the flow from the exhaust system. If your exhaust system is not restricted, I would check fuel delivery and ignition coil output, those two items can cause similar symptoms. Good luck.
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