My check engine light came on. I tightened up the gas cap, drove it for a couple of days and it cleared up. I too it in to Sears because the maintenance check was due, and had an oil change done and an air filter replaced. I described the initial problem to and was told by the Sears service Mngr that I had PO EVAP emissions control system leak (Large), which they could not fix. However, since readjusting the gas cap, and having the maintenance check done the problem seems to have temporarily cleared up. My research has led me to the conclusion that my VENT SOLENOID AND CANISTER may need to be replaced. What are my options?