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What kind of maintenance has the truck had? How many miles? Does it happen only on hills? Is the check engine light on? Need more info to help you out.
The oil has been changed every 3000, and the air filter was changed 2000 ago. It just happens up hills, has 75,000 miles on it, and Check engine light has come on just once.
I am having the same problem on my truck too. Its an 00 F150 with about 100k miles on it with regular maintenance. K&N Filter. Its just been tuned up with plugs and fuel filter. Cats have been checked. Still same problem. I have also noticed a 3-4 mpg drop in fuel economy. No check engine light though. Any suggestions?
It is a slim possibility, tranny has to work harder shifting ect. something to try especially since you have not done it. The filter can get clogged and the tranny strains to pull the fluid through. But normally you will have hard shifting if this is the case as well.
what was the code wehn the check engine light came on? Have the codes checked agien there may be another code that was not bad enogh to activate the light. (pending codes) could help to figure out.
are you using the a/c when this happens? My truck did this too only when the a/c was on. it ended up being a computer problem. the computer forget to adjust the engine when the a/c was on. i had it reflashed and it went away.