My check engine light came on in my 2001 sable and i had it tested(with a hand held under the dash)and it read 2 codes both saying "too lean". I ran a bottle of sea foam thru and it still stumbles while driving.

go get the actual code numbers and re-post

see Taurus forum, change PCV and hose.

Use a can of carburetor cleaner and also check the intake for a vacuum leak.