hey everyone i have a 97 silverado short box with the 5.7 vortec and the issues im having is about 2 weeks ago i had poured some gas in my tank which i think had alot of water in, i had started the truck drove it to town shut it off for about an hour and then went to start it and it was only running on about 5-6 cylinders and has been ever since, no misfires, just dead cylinders, ive tried using different fuel treatments and have ran about 120 dollars worth of gas through it still has not solved this issue, it has no starting problems, just isnt running and all 8, when i drive it the ses light blinks so i dont know if a sensor got bad or what, if anyone has any ideas or knows the problem they could tell me would be greatly appreciated, thanks guys