hesitates on accelleration
Did you check your spark plugs and coils? Clean your throttle body?
How long has it been since you last changed ignition parts (as Tom indicated, this is usually a symptom of aging components like plugs, wires, dist cap (or coil packs), etc. Could also be a fuel flow issue like clogged injectors or partially plugged fuel filter. Have you had it on an anaylyzer to see if you are recording any trouble codes?
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