Czech that the lands are well placed and clean, then check that sensor that you say because if it is a magnet captor you will not have a spark, and you will repair it, if it is the speed sensor then you would not have problems at the start, the other thing that is important so that we advise you is that you tell us if the vehicle does not part due to lack of spark Computer Blokeo problem, but first the lack of spark or fuel first.