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Check manifold pressure at idle should be round 0.4 bar or 4 psi with just ignition on engine stoppedshohld read 14 psi or 1 bar
if the monifold pressure donest go down to arround 0.4 bar when idling you likely have intake leak
also check the long term fuel trim at idle if its way positive like 15-20% likely exhaust leak
see if afr ais stagle round 14.7 at idle when warmed up if not you got fuel issues. If its hunting up and down fairly quickly like to 16 then doen to like 12 its usually the 02 sensor cone bad
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