Need to test fuel pump pressure could be weak fuel pump the fuel pump when it starts to get wore out when load is put on the engine it will start to miss especially cold weather must have a steady needle on the pressure Guage jittery needle will indicate a weak pump. needle Must Be steady.
Check the cheapest and easiest thing first. Try the fuel filter. https://www.youtube.com/watch?v=8QO4uxyX8s0
SOURCE: what would cause my '02 Camry to hesitate, buck,
Even though there is no check engine light I would still take it to Auto Zone to see if there are any stored codes.
SOURCE: My 1993 Buick Roadmaster hesitates and jumps going up hills.
Have the fuel pressure checked the fuel pressure regulator valve may be acting up, it should be at 30 psi or greater at idle. It may also be a Oxygen sensor causing the car to run lean on acceleration, if it has never been changed have the primary or bank 1 O2 sensor changed out they should be done every 60,000 - 80,000 miles. If all this has been done there may be a vacuum leak somewher in the system and by the way all vacuum hoses should have been checked during the tune up.
SOURCE: car stutters when going up hill, what would cause
sounds like a common sign of a clogged fuel filter!!! hope this helps.
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