How many miles do miles have to drive to reset my ford f150 computer

Could be a fan clutch, sticking thermostat, or restriction in the cooling system including air in the system.

ild check the egr system ..the valve may be dirty or partly clogged or the egr sensor is going bad

IT IS NOT A CERTAIN NUMBER OF MILES
READ THE TEST DISCRIPTION AT THE WEB LINK BELOW, FOLLOW IT TO THE "T"
http://www.obdii.com/drivecycleford.html

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

You have to drive the vehicle after the codes have been reset to let the monitors do their tests....If every test ok it will pass inspection....Its usually about 75 miles.....

you need to have the codes read in the trucks computer,you can have it done at any shop or autozone does it free,there is something the computer saw that might affect your fuel mileage or your emissions

You will prob have to take it to a ford dealer and have them reset the trans comp. Sometimes the trans comp is set with a specific vin or serial num for the tranny and will need to be reset to read the new one.

Take it to auto zone and have them scan the computer to see if there's codes. If you want to reset it by driving it might take up to 100 miles and you'll have to drive it in the city and freeway until the computer relearns all of its settings. I would just take to auto zone and have them reset it, its faster.

try replacing the oxygen sensor(s). PLEASE RATE MY ANSWER.

How many miles on it? Do you mean overdrive? Over drive will clunk when shifting in cruise. Mine lasted 212,000 miles but I have heard of them going out after 120,000, depends how you drive. That Traney is good till it starts acting up then you will need a complete overhaul. I got it done for $1800. Do not go to a Ford dealer, they quoted me $3200.
Jeepgreg