I'm using a Nissan Sunny B14 (limited) (1998) (Manual transmission) and for quite some time, when the engine is in the idle state, the RPM drops to 0.5-0.6 even the AC is on. Usually, it was in 0.9-1. I've been maintaining it well, using 95 octane patrol and doing the full engine service every 3 months (in 3000kms).

What could be the possible issue with this?

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