Engine starts, runs rough (like cylinder missing), after a minute will run smooth a few seconds, then back to rough idle. new gas, new oil, gas filter seems clear. What else to check?
Garden - Craftsman - 20 hp 42 in. Deck Yard Tractor
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Answers & Comments
Establish which is the 'lazy' cylinder (touch the exhaust pipe header with a WET finger). There will be a marked difference in temperature. Change the plug on the 'lazy' side. If no better, check for a good spark - with engine running on the good cylinder, connect the other plug lead to a spare plug and grund the plug body. A weak/internittant spark will be readily apparant.
If there is a spark problem, replace the coil on the dud side. If not, check for equal compresion on both cylinders.