Engine Code 1494

i have had my check engine light come on several times about this code...my mechanic said it had something to do with a pollution control vaccume or pump...any one had this code before and how do you go about fixing it....it used to only seems to do it when the car sat for long periods of time and then is cranked (2-3 days) but the other day after running it every day for atleast 2 weeks i went to my car after school to leave and the light came on again....went to see what it was and it was the same code! :screwy: anybody ever seen this code before???

I don't know off hand, but when I get home I'll try to check my haynes manual which should have that one in it. Post later.