I would check your hub bearings in the rear as well. My 04 had a similar issue that progressively gotten louder. I had changed the fluid when I got the car and it didn't fix it. The noise had sounded like it was directly behind my head with the convertible top down. I was able to notice a little...
Another thing to check is the spark plug wires and coil packs. I bought a 2004 convertible with low miles and figured I would replace the spark plugs due to the age. I didn't realize when I pulled the spark plug wires off, the boots messed up and caused the motor to buck like your describing...
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