Ok maybe this belongs in the what did you do to your ZHP today thread but I put some gumout in the fuel tank on empty today. I drove it for about 15 miles and the idle went up from about 550 to 700 where I think it is suppose to be. I probably should have asked here if it was a good idea as I don't want to melt any seals or anything. However after I filled up and drove another 20 miles the idle went back to 550-600. Is this anything I should be worried about?