We have a 1996 Mustang V6..when we bought the car the check engine light was not on..after about 2 weeks it came on...I have had a guy work on it several times..they have put a new Purge Valve on it the first time. That is what the computer stated was wrong..plus several new hoses. Now the light come on and will stay on for 10 miles or so and go off...then come back on..it has stay on for a day and went off..everytime I take it back the error code is P1443. They say its in the fuel vaccum system. Anyone had this problem or know how to repair it?