What you want is a UTEC (User Tunable Engine Computer). You remove the computer, plug it into UTEC, plug the UTEC in where the computer was and then can use a PC to adjust certain settings while the stock computer maintains the rest. They are widely available for vehicles such as the WRX and Lancer Evo but I have yet to find one for the PT Cruiser. I suspect there's not enough demand.
RN
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See Mephisto
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2001 Silver LE 5-speed with: way too much to list here (255 character limit)
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