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I would change the CPS and see if it clears the problem up. Then buy an extra one and keep it in the truck.
There is a guy on ebay who sells two new CPS for our PSD and they usually go for between $85 and $120 for both, shipping included. If you keep the extra one with you you can sell it to someone with a broke-down PSD for $100 with good conscience and he is getting a GREAT deal.