I have an issue with my honda civic 2000 EXI automatic with ac and rpm. Car engine is new installed 4 months before. no noise no heat , water dropping engine. Problem is when i turned on my ac, rpm goes down instead of rising, and engine turn off. i changed the oil, filters( both oil and air), spark plugs. Service throttle body, tappet service, cng kit service etc. An electrician install some more cut-outs for more power to ac. Also refill ac gas, ac filters, ac service, ac belt.but problem still exist.