Could be a number of things really. I learned this when my 40hp Merc 2 stroke was having fuel delivery issues. You really have to start at one end and work your way through the system.
Mine ended up being a deteriorated gas tank to engine fuel line from the ethanol gas the previous owner used. It flaked off the inside lining on the line. I replaced the line but still had issues. I then replaced the fuel filter but still had issues. So I then checked everything from the gas tank to rebuilding the carbs. Still had issues. It wasn't until I replaced the fuel filter for a second time that my issue was solved. Turn out there were still some remaining flakes that passed through the fuel system and partially clogged the recently replaced fuel filter.
Could also be something not related to the fuel system. Sounds like you need a better mechanic....
Thanks for all the replies. Sounds like starting in shallower water might be best. If you only had a couple days, would you focus on points or coves? Also, in general on Stockton, is the main lake or up one of the two big arms considered better? We will be camping, so I want to pick a campground with a launch closest to the area of the lake that I should be targeting.
Is there a particular time in the fall that is better for walleye on Stockton? I was thinking about taking my boat down to the lake next week(end of October) but I didn't want to waste the effort if it isn't a decent time. It seems that some people talk about Nov-March, so is October considered a slow or transitional time?
I have never been to Stockton. Have only fished Smithville since I got my boat last year, but that lake has proven difficult to figure out as far as walleye go. So I am looking for something better.