Engine keep runing after turn key off

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Re: Engine keep runing after turn key off

HI Guys ... This could sound funny but it is true , After I turn the key to stop the engine this keep running for like 30 sec . if you turn the key on it just keep running like nothing ,

By the way after this happens Idle speed is a little high or doesn't shift on idle , In other words it goes from forward to neutral , so there is no idle

Engine is a Volvo penta 4.3 with a SX drive.

All help will be appreciate Thank you

I didn't notice anyone posting this reply, I have the same setup and it says in the manual to use 89 octane when fuel started getting real expensive I dropped to 87 octane. I noticed that when the engine got warm it would do the same thing, found in the owners manual that it says if you get engine run on go to higher octane, hope this helps.