Lots of info on P1345. Need a scanner capable of reading it , live data, then adjust accordingly. Could be a wore out distributor gear, or timing chain, could just be a little twist of the distributor. Google is your friend here.
The "recirculation" operation is somehow directly related to the "Air Inlet Pressure switch" (mounted on the compressor. It is available in various colors for different operating pressure ranges, best reference is from Four-Seasons A/C catalog. From what I can deduct is the system pressure...