Many people talk about an EGR valve going bad is a commen issue.
Low speeds indicate shifted belts in the tires. If it also pulls to one side, try rotating that side front to back.
Low coolant? Cooling system airbound?
P0562 System Voltage Low
Low oil pressure
It would depend on what you call low speeds.
The low side service port is located on the suction line at the top of the engine.....
At idle or low engine idle speeds you motor may surge. This could be caused by an air leak in your intake manifold or a bad sensor like a TPS or MAP.
Not always, but 99% of the time this is a sign that the Blower Motor Resistor Pack is defective. Replace it.
automatic transmission solenoid switch latched in low/reverse position
Low pressure also contributes to the storm surge.
It Adjusts the shift timings making it shift harder at low speeds and easier at high speeds. Ergo increasing fuel economy when driving longer distances. In reality it probably increases 2-3 mpg
The most likely cause would be low fluid level.