I get an engine surge at 45-55 mph. It resembles a downshift from overdrive. I have had it to a dealer twice. "Cannot duplicate problem". It's normal and is the torque converter clutch cycling". The transmission has just been serviced, throttle position sensor replaced, injectors cleaned, new fuel filter all with no effect on the problem. No codes are thrown and the "service engine soon " light does not come on accept at start up when the truck is cranked.
The truck starts easily, and runs well, however, the exhaust sounds splashy at the crusing speed of 45-55 mph. The surging is most noticable when there is a light load (long incline) and the accelerato is applied lightly (feathered) to maintain speed.
I am about at wits end. Truck has 130,000 miles and has been perfect up till 120,000.
Any help
I would start looking for a vacuum leak. Check all the vacuum lines for cracks or breakage. Spray penetrating fluid on them until you hear the engine start to stumble then focus the spray on that area until you are able to pinpoint the location of the leak. Best of luck,my friend, Dana
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