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check for a vacume leak on the engine IF the Car has very little POWER & hisses - IT sounds like a Blocked Catalitic Converter- OR even the Muffler could be blocked-SOMETIMES if there is a DOUBLE WALLED exhaust pipe the inside pipe can colapse & cause a restriction.

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โˆ™ 2004-10-16 07:18:45
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Q: What causes a '97 Lexus LX450 SUV to make loud hissing noises when you press on the gas pedal then it slowly accelerates?
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