hi all.i have a L reg volvo 440 1.8i. when i try to keep at any constant speed of about 40 or below the car will splutter and jolt like crazy,but once accelerating away again its fine. if i remember rightly,it only happens when engine has had chance to warm up and not when first started. has any1 got any ideas?im at the point where i avoid town centres as much as possible these days