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Discussion Starter · #1 ·
I have a 2002 Chev Impala, and recently the engine has started hesitating/shuttering, but only when traveling around 90-105 km/hr, and is more pronounced traveling up slight inclines.

Above or below this speed range, the engine will not hesitate at all. The car easily climbs hills at 110+ km/hr, and has no trouble on hills at town/city speeds, even steep ones, and doesn't seem to lose any power, it's only when reaching this unfortunate speed range at very slight or moderate inclines (or when the wind is blowing strongly against the direction the vehicle is travelling).

No indicator lights are flashing on the dash to show that there's any sort of problem.

These are the things I've tried:

** Fuel injection cleaner, multiple times.
** Fuel filter changed.
** Catalytic converter replaced.

Before I did the above, hesitating/shuttering at 50-60 km was common as well, but that no longer happens.

Does anyone have any idea what could be causing such an odd problem?
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