My 01 Expedition had a miss on uphills. I changed the fuel fillter. It only got worse. I then changed the spark plugs now it wont idol for very long. It starts fine and runs fine as long as i'm on the gas. any help would be great!!!!! Than you.

 

check engine light on? any codes? Buy an ODB-II USB connector for your laptop for 20 bucks offa Ebay and find out your codes....

 

I found the problem. I pulled a vacume line off. Thank you for your time.

 

oops...it happens