Starting problems

Hello folks.



Since yesterday my megane 1999 1.6 wont start. after browsing forums all over i have yet to come down to a solution.



Heres the layout.

I start the motor revs it starts but as soon as it does it cuts out. turning off every light in the dashboard and every electrical component including radio



i have ruled out the immobilizer(the light goesoff)

i have cleaned the tdc sensor but nothing happened

the connectors to the tdc seemed fine

i have unplugged the sensor itself and the car revs until i stop trying to ignite wich rules out a fault in the starter.

i have cleaned the engines ground connector but it did not help



the battery is at 13v and close to 14 when running

the key batter is working.



here is the spooky part . i can push the car and it runs fine in when pushed off to a start.