Q: I have an 03 Tahoe and this morning it would not accelerate very fast.

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this morning i tried to accelerate from a stop and i could only go 20mph. i backed off pedal it seemed to help alitle but still goes slow. i do hear a hissing sound when i am at idel and when i press the gas pedal. can you help.

My car has 175000 miles.
My car has an automatic transmission.

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