Referring to the engine when the accelerator is depressed and the engine does not seem to keep up (hesitates) with the driver's demands. Hesitation can be followed by stalling (engine quitting) or by surging (engine building power without notice).

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Hesitation or low power at slow acceleration

Subaru 2004 2l auto tip tronic. It seems to hesitate or have slow or lack of power when you accelerate slowly