the iscv can be cleaned im sure if you do a search on here you can find the proper way to do it! but i just take it out squirt it with carb cleaner until the manky shit runs clear i think the cutting out problem could be your water temp sensor (blue one-back of the head.)only about £25 from woodford garage.a guy off here sells them on ebay,i seen a pack of three different sensors for £28 i think his user name is matt lewis