[RCW]

I think you are on the right track with the fuel. Pick up a fuel restoration and preservative such as PRI-G and keep it in your fuel. Hydrotex also has fuel system cleaning products, but they are largely unaffordable for a regular guy. Sometimes you can get away with the fuel conditioner from Evinrude/Johnson and it will work too, but the PRI products are the most affordable of which I am aware.

It will clean out the crud that is in the injection system after a tank or so.

The problem is the oxygenated (ethanol alcohol added) fuel we have goes bad in as little as two weeks. That leaves deposits in the fuel system.