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It could also be a vacumme leak. A quick way to check for that is to starting fluid around hoses and gasket areas. If the engine picks up speed when you spray around the engine and not directly in the throttle body, you have found your leak. I also believe these cars have an idol air control valve or IAC that might need to be cleaned or replaced. Check your spark/coil wires while you are checking around.
My online Sonata manual shows these possibilities, but does not identify which applies specifically to 2000 Sonata. Also, when you talk to the dealership parts counter, you'll need to know whether your 2000 Sonata is (a) 4-cylinder 2.4L MFI DOHC engine, or (b) 6-cylinder 2.5L MFI DOHC engine. Its easy to tell - just count your spark plug wires.
-- begine excerpt from 2000 Hyundai Sonata Repair guide --
The crankshaft position sensor is located next to the flywheel. The crankshaft position sensor is located next to the flywheel/torque converter. The camshaft position sensor is located on the engine near the timing belt cover and under the upper radiator hose. The crankshaft position sensor is located on the driver-s side of the vehicle, down by the lower radiator hose. The crankshaft position sensor is located on the engine near the crankshaft pulley. The crankshaft position sensor is located at the front of the engine near the timing belt.
--- end excerpt from 2000 Hyundai Sonata repai guide ---
The turbine shaft speed sensor can cause this problem, It is also know as the transmission input shaft speed sensor. It will cause the transmission to **** and also stick in 3rd gear, which wound cause slow acceleration.
I have a 2002 Hyundai Sonata and I had the same problem. But mine would always shift into 3rd gear and STAY there until I turned the car off. I took it to a Hyundai dealer and he had to rewire a speed sensor on top of the transmission. Apparently a little animal got up in that tight little spot and gnawed on my sensor wires. The car has run fine since. To make a long story short, it might be your speed sensor on your transmission.