well, the DTCs are starting to pile up; I replaced the Thermostat after scoot scoot spit out a P0597 at me several times. now I have a P0599 and a P0445 in addition to the False P0420 that pops up now and again. ive checked all the connections both electrical and EVAP to the Purge valve on the intake manifold. (i think my P0599 has something to do with my coolant consumption problem, which I finally managed to trace to the radiator side tanks leaking; so that means I can kiss $200 goodbye for a radiator.) but I am kind of stumped on the P0445; I havent had any problems when refueling, but i still have that annoying chuggle when fully warmed up. any help is appriciated.