MTD walk behind with Honda. Stopped to move something out of way and it wouldn't start. I checked the normal, fuel, spark, and only thing I noticed was spark started strong and then died down low. I checked using other plugs and verified the spark starts real strong then drops back. I'm using a half inch drill motor to turn it over while trouble shooting. I don't see a normal electronic ignition, no points or condenser. Is the coil pack the complete ignition source except for the flywheel magnets? What determines spark strength? Any suggestions?