2001 SSEI, ~127K miles
When I slowly accelerate (especially getting up to highway speeds), keeping the RPM'* right at 2K, the engine surges. It acts like someone has reached into the engine and pulled off 3 spark plug wires. If I gas it, everything is fine. It'* just around that 2K RPM window. I've replaced the spark plugs and spark plug wires. I've also had the throttle body and fuel injector service from the dealership. This was all before the warranty expired and I haven't been back to the dealership yet. Any other ideas?
Btw, this problem started about 30K miles ago