Vibration and low idle, when in drive and at lights, Low RPM.

Has a new battery. Plugs had been replaced, oxygen sensor checked and MAF cleaned by his mechanic.

Experience the Vibration problem as explained, at a set of lights in gear with foot on brake as explained.

Looking at the live data when the engine is at operating temperature and it starts to play up, can see the purge solenoid percentage opening and engine starts to run lean. Smoke test, no vacuum leaks found.