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

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Can you give us any more information? Does it always do this or only at certain times? Does it make a difference where in the rev range it is or what gear it is in? What about whether the engine is hot or cold? – Nick C Jun 27 '11 at 11:43

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What you need for proper engine operation is a) air, b) fuel & c) ignition. If the the air intake is not obstructed, the throttle plate/cable not loose or sticking, then look for spark plugs and ignition wires. If all that is sorted out, look for fuel pump issues, or sensor errors (although you did not mention a check engine light).

Most likely you need to replace the plugs, and/or the ignition wires.

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It does not matter if hot or cold. It's only when ...like acceleration out of a drive way. – Shane Jun 28 '11 at 5:33
A throttle position sensor error might slip by unnoticed by the computer. I've had that problem before. – Brian Knoblauch Jun 28 '11 at 12:10

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