It sounds like Peach Leaf Curl you can get some information about it here
http://www.caf.wvu.edu/kearneysville.../omplfcrl.html
We had this on a tree in our garden and in the end we got rid of the tree because it was impossible to spray a large tree in an ordinary garden without huge disruption and expense. Come to think of it my husband was very keen to get rid of the tree, maybe it was because it overhung the drive and the birds settled in the tree and 'targeted' his car!