Avanza Fluctuating Idle Problem

[mina_nuka]

Sir huwag po muna ninyo ireset ang ecu i test drive po muna ninyo hangang lumabas ang CEL tsaka ipa diagnose

+1
Do not destroy the evidence prior to and during the investigation.
Have you had the intake manifold vacuum checked with the engine running at idle both cold start and at normal operating temperature?
What was the fuel trim reading from the scan tool?