I have a Snapper Chainsaw ModelS1838 and I would like to know how to adjust the idle as i got it back from the shop and it don't idle like it should however everything else works real good.Since this is the time of year that the repair shop is overloaded. Since I have experience as a mechanic. Give me the details of how to accomplish this task as the owners manual is of no help. Please respond to my e-mail. Will be looking for your response. Thank you Douglas M. Hypes