My 2004 Buick LeSabre recently started behaving strangely. At first I thought I had filled up with some "bad gas." I used Heat to treat and after a week or so it seemingly started to work fine.
Then today, it is raining pretty steadily and as I was driving on the interstate, it started sputtering again. This was after about 10 minutes driving in the rain. I can set the cruise control and it will run "fine" until it needs to accelerate. Same thing happens when I come to a stop and need to accelerate to get up to speed. I have to slowly accelerate, giving it only a intermittent tap on the gas pedal until I get up to speed, otherwise it nearly dies.
Any idea on what this could be? I don't want to take it to the dealer for exploratory surgery until I have a somewhat educated idea of what the problem could be.