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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
as said to your original question, aka secondary pickup coil.
but - like squirrels said, that part won't cause surging idle. surging idle is a 75% chance is the TPS (throttle position sensor) and 25% that its IAC (idle air control). each is about $40-50 at any parts store.