Well, a variety of things would cause sputtering and hesitation. When the engine is cold, the thickness of oil is greatly increased, and may not make it all the way up to the top of the valves and that would make the engine rumble and die. Colder temperatures also would make a throttle stick, causing hesitation. Your choke may be sticky. Maybe your temperature sensor is off, and is registering the 'cold' temp colder than it actually is. At any rate, plan an extra minute or two and LET YOUR CAR WARM UP before you drive it. And remember, everyone else on the road has had their cars sputter, hesitate, and die in traffic. It happens when its cold out.
If it is a new enough Toyota the fuel injectors take a while to warm up and often does that in my truck don't worry about it but let it warm up like five minutes or so before going over twenty-five or so.
My experience with a '98 Tacoma 4 cylinder: the mass air sensor was dirty. Twice.
It is just downstream of the air cleaner. First time a small tear in the air filter allowed dirt in. Second time a tiny bit of hair, probably off my shirt, when I changed the filter.
it could be the coil
Water in engine-head gasket most likely.
It is important to have a well working car while on the road. The lack of fuel getting to the engine would cause hesitation on acceleration,
Hesitation can be caused by several things: 1. A faulty throttle position sensor might cause hesitation. 2. A faulty MAP or MAF sensor might also cause hesitation. 3. A problem with the engine control module might cause hesitation.
when my dodge stratus started to do that it was because I needed transmission fluid.
Could be timing belt/chain is worn
Torque converter going bad.
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".
Most common in these trucks is a dirty throttle body. We have removal and cleaning instructions at our forum. www.trailvoy.com
I would check the plug wires and the exhaust system.
accelerator pump inside the carburator
Needs a full service Fuel pump/filter Incorrect fuel ECU (brain) AFM/MFA (air fuel mixture meter) Split air/fuel hoses