Toyota 2008 CNG Conversion?

My Toyota Axio Fielder 2008 have CNG Conversioned and have some problem as When run by CNG and after then start by Octane then start engine and race (rpm) up to 300 and goes to stop engine, in this time open Battery terminal for 20 minutes and then okay with Octane and CNG. How can I solve this problem???????????????? Thanks.......
 
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