My automatic passat 1.8 T automatic tiptronic 2002 model started jerking when driving from a traffic light and driving up an incline it started to rev high when i press the accellarator . i have changed the transmission oil .The oil has been replaced the gears shift more smoothly but seldomly the same problem occur but to a lesser extend. the diagnostic machine shows in correct gear ratio in 1,2 3 gear

I have the same 2002 Passat with Tiptronic transmission and have changed the transmission fluid as well and had smoother transmission shifts. I never had the engine rev high when accelerating, however. You mentioned driving up an incline. Perhaps when changing the transmission fluid you didn't add enough. The procedure for adding transmission fluid is very critical for proper fluid level. There is a large hex plug (I think 17mm) in the bottom of the transmission pan that if removed, no fluid should come out if the car is level and the fluid is at or below 113 degrees F, and the car is RUNNING in Park. That's because there's a riser tube in the hole where the hex plug was removed that rises up to where the top of the fluid level should be under certain conditions mentioned below. DO NOT GO UNDER A CAR, OR LET ANYONE ELSE GO UNDER A CAR, UNLESS YOU ARE SATISFIED WITH YOU TAKING YOUR OWN SAFETY PRECAUTIONS. IF YOU PERFORM THE FOLLOWING PROCEDURE, YOU DO SO AT YOUR OWN RISK! Let's talk about how to drain the old fluid. Run the engine in PARK to warm up the transmission fluid to a temperature that won't burn you. To drain out the fluid, you must remove the quantity (27) Torx 27 (T27) cap blots from the rim of the transmission pan and drop the pan. I highly suggest replacing the filter and pan gasket. I used an AMSOIL recommended ATF transmission fluid (go to the AMSOIL website) instead of the very expensive VW OEM transmission fluid. I have had no problems with the Amsoil fluid in my 2002 and 1999 Passats with over 100K miles on the Amsoil fluid between the 2 cars. When adding fluid, start with NOT running car engine, make sure car is level (use a magnetic level on the transmission pan both front to back and side to side) and then add fluid with a syringe or gravity feed up into the riser tube until fluid overflows out hole. Now, if that's all you did with your transmission fluid change then you will be low on fluid! More fluid is needed! Next, have someone turn on engine and WITH THEIR FOOT ON THE BRAKE AND THE EMERGENCY BRAKE SET AND NO ONE UNDER THE CAR go through the gears slowly (about 5-10 seconds per gear) and then leave in PARK, still with the engine running. The engine has to be running to keep the torque converter full of transmission fluid. Now, add more fluid as described below and wait for fluid to overflow out the hole all while the fluid is at a theoretical 113 degrees F, readable with a VW VAG diagnostic tool or a Ross Tech VAG equivalent, which I now own, but not when I changed fluid. So, what I did is use my hand on the bottom of the pan and estimated what 113 degrees F was. (This "human temperature gauge" procedure worked well for me at the time and both cars have been shifting very well ever since.) THEN, WITH THE ENGINE STILL RUNNING AND IN PARK, REINSTALL THE 17MM PLUG IN THE TRANSMISSION PAN. You now have the correct transmission fluid level in the transmission! I hope this helps you and others! Remember, SAFETY FIRST!