fuel pressure regulator or the injection of the fuel
blown headgasket
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".
Blown head gasket or cracked block.
probably the O RING which is located under the spigot swivel
check plugs &wires
plugged cat, but make sure you check your spark plugs and wires. If its time to change them , then change them first and drive the car. , if sputtering continues, check the cat and the ignition coil.
When you are accelerating and your vehicle is sputtering, it is usually a misfire in the engine. Meaning one of your spark plugs or wires is malfunctioning. A simple tune up will fix this problem. Sputtering caused by a misfire is usually accompanied by a jerking of the vehicle when Idle. IF you are at a stop sign and you let go of the brakes, your vehicle will start jerking forward on its own without pressing the gas. try a tune up.
You may have a corroded fuel pick up line or a fuel pump that is in need of replacement
Its your coil packs, they become defective after time, it causes a sputtering and loss of compression. Also check the intkae manifold. the throttle body control will regulate fuel to stop sputtering set idle for around 900rpms
Sway bar bushings
Heater coil could have went out.
Not running on all cylinders? Bad plugs, wires, or valve? Try a compression test to see if problem is internal to the engine