I have used Marvels with good results. A neighbor has his RV sitting for weeks at a time (old 440 with a carter 2v) and he told me how it races at idle. Figured bad gas with stuck needle. We drained the tank, put in good gas and I told him Marvels is the only thing i have found that delivers what it promises. H3e ran a tank of good gas with a bottle of Marvels and when he returned from a run to the coast (40 miles one way) he was grinning like the cat who swallowed the canary. He now runs a bottle of the stuff every trip and no problems.....Russ _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com