fuel interuption or spark interuption on hard right turn

My venture just started studdering after a hard right turn??? No warning light or codes present. We had a very wet weeked 164mm on saturday. and the problem started on sunday night. Also added methal hydrate to break up any water that may have gotten into the tank. I then replaced the fuel filter and it seemed to fix the problem for about 100KM before it started again, not as bad but still occures on every forth 4 or fifth right turn.The only other thing i can think of is spark.Water in the wiring etc. Has anyone out there encountered this problem.