What could cause and engine to have a knocking tapping sound and lose power on 2000 Ford Escort

This occurs when the vehicle is warm and in gear. It does not do it in neutral or when I let off the gas while in gear.

by in Butler, PA on July 06, 2013
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1 answer
ANSWER by , July 07, 2013
sounds almost like sticky valves either additive or a cup of atf in the oil