Il y a une question à moi
That could be heard from a native french speaker. But is not grammatically correct. Its meaning depends on the context :
Il y a une question pour moi
You have got the good meaning for that, no need to explain further.
Il y a une question de moi
Means this is a question i submit
Il y a une question à :
This construction makes sens, but should be followed by a subordinate clause, such like :
Il y a une question à laquelle il faut répondre
Il y a une question à creuser
The first sentence means that the question has to be answered soon
The second sentence means that the question needs some further research.
Il y a une question à reformuler
Means the question has to be rephrased.