1985 Merc MR 200 runs ok in neutral and underway when slow, but once given some throttle it bogs down & dies. It will restart and stay running if feathering the trottle and will ultimjately idle 'normal' again after a short while. I am able to rev high in neutral and it will happen as well. Replaced fuel filter, plug wires and cleaned cap & rotor. Fuel is new this year and has stabilizer in it. Carb is a 4bbl rochester quadrajet. Had fuel issues last year and changed tank. I would appreciate any suggestions!