Hi, I am new in here and I want to ask something about my civic. Mine is a 99 civic EX with manual trans. I replace my clutch to XTD Stage 1 clutch and a 8lbs flywheel at 4th of jan. It was fine untill 2 week ago, my car start jumping when I start from a stop or tring to move in a slow traffic. it just feel I was riding a horse. It's ok in 2345. Only in first gear. Sometime it seems nomal when the car is cold but when my car is wormed up, it will start jumping again. If I press the gas to 3000rpm and the car run fine. I know it's hard to imagine but I really want to know what wrong with my car. Thank you so much.