The Shinny 357 is known for its starting problems some years ago the was a kit that was a retrofit for the reed valve. It was called the "Hyper Kit". This was 10 years ago or so..............this may or may not be your problem. try fattening up the low side a bit. Make sure to readjust the idle speed as richening it up will bring the idle down. Make sure your air filter is clean before you do any adjustments!