T350 holding onto the revs

[NWTony]

Following on from my loose battery terminal excitement, the car now holds onto the revs when changing gears. It also appears to idle a little high, say 1100 vs 900. It does it out of gear too, blip the throttle and the revs take a long time to fall back down to idle.

ECU relearning the settings, sticky throttle cable, something else?

[NWTony]

Thanks for the responses, the 3k rev thing does seem to apply so it may be Lambda sensors, but I'll check the cable n carpet n what not to.

[NWTony]

Thanks again for all the help, it has mysteriously remedied itself but I'll keep an eye on it.