Dear Friends , please help me to sort my car issue, i m not sure this electrical or mechanical issue, My nissan wingroad ( Auto ) 2002, engine is Qg15
theres an engine knock i cant sort this out , i did the efi tune up, did the exhaust Analyzer test, and no engine fault codes also, when i stop on gas some times it knocks
and RPM is not moving mostly but when in Neutral its going up, ,this happens when only in drive ( D) positions neutral there's no knock at all , i use only 95 petrol only
i don know who can diagnose this , but im not sure to who to take to , most of the guys still couldn't figured , please help , thank you all, My ATF oil also good,