Bringing this old thread back, I have a question on some of the fuels with ethenal. I've been told that Costco fuel contains a good amount of ethenal as with 76. Is this a bad thing with these injectors? Just developed a problem like a lot of people here with intermittent stall on engine start. After driving with slight throttle, will clear up for a day or so. Just tried cleaning the idle control valve and throttle body plate area. I will go purchase a new ICV if the cleaning fails to cure the problem... While cleaning, is it bad to move the pintle in and out to clean the shaft?