81 300D produces much blue smoke & runs rough for about five minutes after first start of the day. 'Clears up after this and runs very smoothly rest of day 'til it sits for few hours not used - does it every time it is started after sitting for few hours unused. What is most like culprit? TIA

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Wilton Strickland
Goldsboro, NC
91 350 SDL. 81 300D