Grammar yes your post could do with that,any hoo.
Sounds like not enough power getting to the starter motor.Are you using a battery or just coming straight off the car?
If your going to a battery,the battery needs some kind of life even when being jumped to.If straight from car then would possible need some sort of other battery.
These sorts of problems can be a pain in the bum.Could even be other problems such as not great connection within jumper leads.Dirty connections etc,might just need to play around and work through each problem.Hard to say without being there.
