Well, my problem is fixed. I had a Culligan Super S whole house filter installed yesterday. The problem is now gone. I can't figure out why this cured the problem other than adding a little bit of restriction immediately after the water tank. This would be easy to duplicate. Just close the valve after the tank a little and see if this cures the problem. A failed air volume control valve located at the pressure tank could allow air to escape from the tank and into the water system. The valve may not be bleeding off extra air in the tank. Turn off the power to the well pump and turn on a faucet until all the water and air is gone. Turn off the faucet and turn the power on for the well. If this solves the problem for short time(a week or two)then replace the valve.
Water in engine-head gasket most likely.
it could be the coil
Ask your plumber to install a water hammer arrester.
clogged fuel filter, or bad fuel pump
distributor located under the water pump. I had to change mine. Usually what happens is as soon as the engine warmed up, it was running like crap.
Any break or leak on the suction side of your pump can cause air in the lines.
More than likely the gas has water in it.
when my dodge stratus started to do that it was because I needed transmission fluid.
Lime buildup in your water lines. No, it wont hurt you.
I sometimes sputter when I'm nervous. Please reword the question and tell me what year and engine and describe what you are doing with the car when "sputtering" occurs. Would help if you can think of additional description of what you mean by "sputtering".
Sometimes there is water mixed in with the gas. This will certainly create a problem where there was none before. Water in the tank can be very damaging to an engine. There are additives that will help. And afterward try to avoid filling up at that particular gas station.
If the lines inside your home or metal or galvanized then it is most likely rust - called tuberculation.