i have an 01 f150 4.6. it has 125,000 miles on it and ran great till i let my mom use it to go to winterplace ski resort. i know she did not run it hard. but i got it back and it had a miss in it when you gave it any gass and it lost alot of power. ive had the truck for about a month and it has always had a cel for egr flow insufficent. i pulled off the upper intake and cleaned all the carbon out of it(it was verrrrryyyy bad) and cleaned the egr valve out and it seamed to be fine. i also changed the coil packs(i had a spare set) and it made a difference. but it still chokes up and has a slight miss. i drove it for about 45 min and it threw a cel again for a egr insufficent, something to do with a gas tank vent. i have changed that sensor as well. truck was just tuned up with all motorcraft parts. plugs, air filter, fuel filter,. i just need help. im lost. lol