If it runs well enough to drive then take it out on the road. A driveway reve tune is tough to pin point prob. Take phone with you or tool box.----- I had a defective new coil truck ran good in yard ,when out on road as coil heated up it stumbled enough to blacken plugs. Bring it home clean plugs ,monkey with carb.(now i know carb was fine)start up good and do it again.First bad coil in my life.This one had me chasing my tail because I should have stepped back and thought it thru.
