Engine studders after right turn from a stop!

My venture just started studdering after a hard right turn from a stop ??? 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. All ready throught the intake and head gasket thing.

Check the electrical connection under the drivers seat that the fuel pump hooks up to. More then one person has reported water problems. Also make sure that the pins are making good contact. I had a problem a while back were the car would just start to studer for no apparent reason. It ended up that the pins were bent ever so slightly too much so it would make an intermitten connection.

The connection is tight and the contact are clean
Its still studders on an right turn from a stop ! any other ideas before
I that it to the dealer.