Depending on the sampling rate and logging, I've seen issues where the TPS is shorting out and you can't see it on OBD-II logs but can be spotted if you put it on a scope. It can take a long time (if ever) to trigger a code but is long enough for the computer to keep the A/C clutch from engaging and might cause it to not go into deceleration fuel shutoff. Another thing of the top of my head would be to check and see what the fuel pressure is doing and pull the plugs out to "read" them and see if one injector might be leaking.
Eric H. - '04 Neon SRT-4 (eBlue/S2) - '04 SRT-4 (blk/stock)
'92 Dodge Daytona IROC R/T --
'91 Dodge Spirit R/T
plus a couple other turbo Dodges, a Cobalt, a couple Focus, a wagon, and some other stuff...