Mower ignition wouldn't work last year. By passed the ingnition by directly applying power to the starter. Mower worked fine all season until the starter failed last fall, luckily at end of season. Just installed new starter. Still bypassing ignition. Started like a dream but as soon as I take my foot off the brake the engine dies. Transmision fine. Blades spin. Not sure where to look next. Would appreciate any ideas. Thanks