my car idles fine most of the time, but lately it has been acting up. in the mornings eventhough i allow it to warm up for about 7 to 10 minute,it seems to be around 1,000 to 960 rpm. after that it seems to stay around 930 rpm's or so. and it a rare occasion it stayts where it is suppoded to 850 or so. has anyone experienced high iddle? Spark plugs are new, new oil and airfilter. can it be a vacumm leak or something like that. or dirty fuel injectors. 1991 Legend L, a/t 70000 miles.