Dadio

Hi all, I've got this odd throttle response from tickover where you very slowly and gently push the pedal down but instead of increasing the revs smoothly it suddenly jumps to about 1600rpm

Initially i thought cable but this appears fine, the fault is still there when you increase the rpm by hand at the throttle body.
It was suggested (on Facebook) it might be the TPS, so resets were done, no change. TPS checked but appears to working fine with a nice smooth increase in voltage as the throttle is opened.
IACV, its not hunting, no idle issues starts and runs fine. The only thing i'm not sure of is that i can hear it ticking/stepping occasionally while the ignition is on but the engine is not running (I bought a cheap OBD reader so have been playing this afternoon so the engine has been on/off). Not sure if this is common behaviour for an IACV when the engines been run in short bursts?

I've cleaned the IACV and throttle body, nothing too bad, no splits in the pipes etc and all looks ok. Nothing untoward from the OBD reader either.

Any suggestions greatly appreciated before i start throwing (more) money at it!?