cosrep

A friend went through a small flood about 4 inchs deep he said and continued on his way home, next morning he was driving to work again and as soon as the car reached normal working temp it lost power and sounded like its running on three cylinders with the odd pop from the exhaust under acceleration.
When the engine is cold it runs fine but when it warms up its runs like a dog, there is a spark at all plugs and I can't see any diconnected sensors or the like......it only started after the flood incident.