So..drove my 1200 beetle few weeks ago..nice run..parked it up..2 weeks later..thought i would go for a drive as stopped raining! The car was misfiring and spluttering all down the road..nothing had been touched? I thought maybe electrical, so changed cap, all leads, coil for new ones..plugs look fine and the distributor is only a few months old. Some of the misfiring has gone but it has no power in 3 and 4 gears...almost sounds like not running on all 4? Any ideas?