I have a 1996 Thunderbird with a 2004 Crown Vic engine. Im having problems with idling, the car has been dyno tuned but it still stalls sometimes in reverse and sometimes in drive and it idles up and down. Ive changed the idle air control vavle 3 times and still does it. But im using a 1996 valve should i get a 1999 Mustang GT valve? Im using a the Thunderbird injection system but the Mustang has the same connections but the internals are different. I dont know what to do i doont have any vaccum leaks or anything.