Hey

For a while now ive had an issue with my st170 when accelerating it can be extremely hesitant and stuttery after dropping a gear or keeping my foot planted to the floor it goes back to normal. It happens with any amount of fuel in the tank. What I have noticed is that it happens mainly after I have been stuck in slow moving trafdic or coasting at 60mph in 6th gear and then go to accelerate and there is nothing there. I have changed fuel filter and all plugs. I also have no error codesDoes anyone know what could be the cause. I have trawled the forum for a few days and cant find anything the same. Found a few similar but they all relate to being higher up the rev range. Mine happens at any rpm.
thanks
Ben