Hi, I have a civic model 2003, auto transmission , really got upset when I feel ideling issue in my Civic, Its RPM goes down to 400 to 500 in idle position on AC , the car is on CNG , some mechanics told its chok sensor, may be ignition coil, may be foundation issue, ...
where oil in the car is new and airfilter is also new, any of my freind ever been to this type of issue , please inform ....