Thanks for the reply pizzaguy, its appreciated.
Apologies for the lack of narrative/history > I bought the car cheap on Copart auction back in Jan23 and its the first time I've scanned via the OBD. Its always idled and driven fine during ownership aside from a lumpy idle a couple of weekends ago on first run following the install of the larger TB and MAF housing mod, which settled down to usual.
I appreciate your steer on the cruise test > I shall try this on a run out tomorrow and confirm back here.
I hadn't considered hoax codes.
Thanks again,