I have suzuki alto g2 pehly to rpm drop or up down hota tha electrically sab ok tha mechanic dikhaya to engine pressure kam tha new ring or valves daly l. Lkn ab running taqriban 5 ghanty tak ki hy. Ab ya problem arai hy k kabi kabi ac k sath clutch dbanay sy rpm fully down ja k apni possition 800 to 900 tak ata hy ar engine vibrate karta hy any solution??