engine noise on 2003 Ford Windstar

there is a tapping in the engine ever 15 seconds and it is running very rough. i have replaced the spark plugs, spark plug wires and the value cover gaskets.

by in Hedgesville, WV on January 18, 2010
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1 answer
ANSWER by , January 18, 2010
Can you pull the diagnostic trouble codes from the engine control module? That information would be a big help.