I crank it over and it trys to start the whole time but just will not stay running! I replaced the spark plugs but still the same thing...I think the coil is weak but it tested good with a olm meeter...I don't what to toss parts at it! Carb is working good I disconed the gas line and put fresh gas in the carb after running out what was in there and still the same thing! Any ideas or forther testing I can do?