If only the fix were that simple for me, I tried adding techron a week ago and it was still acting up. Today I changed the fuel tank vent valve and took a mity vac and checked to make sure that the vent lines were clear. The old vent valve did not hold pressure on the side of the tank so I thought for sure that this would be the culprit-it wasn't. The problem has diminished somewhat, it used to be all the time but now it seems to be only when the engine is hot.