Hi guys im new to the forum and seems to be you guys are very helpful to the GP community. I recently purchased a 2000 GP GT and got it for a good price. Seems to be it came with a little bit of work with it ,( hence the price). the first problem the car would accelerate fine until you hit 2000 or 3000 rpms and then it would go up and down and would have to accelerate hard to run thru it. At certain times it would start to shake pretty hard while accelerating.i read on some threads and did a tune up. I got car back and still the same and now i feel tranny slippin while trying to take off . slipping only starts after car is warmed up. Any suggestions out there???