After a few minutes of driving, the truck is sluggish when I turn on to a road. It doesn't happen all the time but it is nerve racking when pulling out into traffic. After a few seconds she picks up speed. I've replaced the catalyst converter and found out it was not defective. Had a complete tune -up and it still acts up. Can you shed some light on my problem.
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What kind of truck and what type of fuel gas or desiel? It almost sounds as if the computer is causing a fatal error and going into an shut down cycle. Some newer vehicles are setup to protect themselves when this happens. Helps prevent major damage to the engine. Is it over heating, if not maybe check that the temp gauge is working correctly. By shutting it off and then restarting you are in fact reseting the computer.
It sounds like you either have a dirty filter, or a solenoid is faulty in the transmission. Change the fluid and filter, put some Lucas transmission oil in it and see if that resolves the issue. If the solenoid is dirty then it will cause the transmission to shift improperly, the Lucas will clean it.
Honestly you should send it into the dealer. I don't think guessing will help you. Typically it is a dirty connection into the steering column (behind the ignition key) But diagnostics need to be run and a look at the VSS system (through a good scan tool) is needed to confirm.