QSD hit the nail on the head! Also when you turn on the Rear Window Defroster/Heated Mirrors and Heated Seats (if equipped), you load up the charging system and that can cause some roughness at idle.
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John & Terry 
"His" - 2002 Inferno Red Touring Edition
"Hers" - 2003 Electric Blue Limited Edition
Del Val PT Cruisers
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