When I let off of the gas pedal, I hear a very loud sucking noise coming from my engine. It only does it when my explorer coasts, and gets louder at a high rate of speed. You notice it more when my truck is gearing down.
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What you are describing sounds like you have an engine bearing failing. Do not drive it 'till you have it diagnosed and repaired (most times though it's too late when you hear it.)..... Outside chance it could be the trans flex plate but I doubt it.