Re: 2003 MT High Idle
P0508 = "Idle Air Control System Circuit Low"
P0633 = "SKIM KEY NOT PROGRAMMED IN PCM"
The SRT guys say that the 0633 is nothing to worry about with engines that are upgraded with "stages" ( PT's only have Stage 1, SRT's have multiple Stages).
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
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