My car dosnt seem to like going slow. Ive changed the Spark plugs, Leads, Fuel Filter and it still seems to jump in 4th gear and also dosnt like doing 40 in any gear!

When its ticking over its fine! When you rev through the geras its fine, Its only when you drive slow through town and stuff.

Could the injetors be blocked? If it was the coil pack it wouldnt tick over right would it??

Help please!!!