i did do that and it stopped after that...i noticed it was mostly when i was going up a hill at around 30 and barely pressing the gas...kinda fluctuated between 1500-2000 rpm, scared the chit outta me...and then i let off and floored it and when i did the same thing again it would happen...
hope its not my tranny slipping...TC would still be bad though
maybe i should check my tranny fluid...honestly have no idea how though