Crewcab F150, 2004, Synthetic Oil, 26000 miles(highway) 5.4L3V.

I have a problem, at about 34 to 40 mph, the engine rpm starts to oscilate, (gas pedal at same movement and level), up and down between 1100 and 2000 rpm. I have taken it to the dealer already and they said a recall was issued and computer corrected for the engines that have come in with this problem. It seemed as thoughit was fixed and the other day it started again..!I am fairly disturbed with this problem, any input would be helpful, thank you.

 

Just a guess here but that sounds like the transmission is shifting between third and forth gear.It may still be a computer problem but could also be a trans problem.

Back to ford to fix.

Mike