i removed an important program from cydia and my iphone is not working now it is starting and stopping all by it self
That's one of the drawback to jailbreaking. Things don't work properly.
Another drawback is that you can't get support here.
The only solution is to force a restore as new and
never jailbreak again.
Discussing jailbroken devices is forbidden by the terms of service. It is not always possible to revert a jailbroken device to a pristine state.
You're on your own.
Retrieving data ...