Hi i have a 1997 ford expedition with rear airbags and in about the last month or so i have noticed that if i don't start the truck after about 2 days the rear of the truck lowers and sags until i start the truck and then it levels out. this started after the truck wasn't started at all for about a month and a half due to some engine troubles and the back really bottomed out but after the repair and a quick drive it leveled out, now it has this problem. I have a fabtech lift kit but this never caused any problems and the truck would sit for a week at a time at times becasue it isnt a daily driver. any thoughts....

 

you got an air leak somewhere, where is the question.....obvioulsy its the rear, but it could be in the line somewhere or one or both of the bags could just be old and giving out. Is it a relatively large incline where you park?