my 2003 galant es 4 cyl w/auto has a very fast idle(2500rpm or plus) in the morning or after sitting for several hours: when the engine and coolant are cool. It goes to normal approx 700rpm after a few minutes when the engine temp starts rising. I checked the BISS and it was less than one turn loose; i turned it in and now it seems stuck, won't back out. I also replaced the CTS and i thought that fixed it, but the same issue returned. I tried disconnecting the battery cable for a few hours and that made no difference and also checked for codes with my code reader;there are no pending or stored codes(obviously no check engine light). This car has 107000 trouble free highway miles. Any ideas?:017: