It very well may not be the TPS. I am not familiar with a faiure mode that results in a low frequency intermittent noise issue on the TPS. Then again, if there was such an issue, you aren't likely to find it when you hook up a scope or scan tool at engine-off, idle, or even most of the time at part-throttle or WOT. The best way to capture it is to monitor ratch and wait for a recurrance. If ratch is below your closed-thottle TPS reading (EEC calls it ITP), than this wacky scenerio is likely the cause.
1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s
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