Pathfinder "puttering" sound w/acceleration?
I own a 1994 Nissan Pathfinder 2WD. It has been an excellent vehicle, but recently I have noticed a "puttering" sound in sync with acceleration at lower speeds that seems to be coming from the engine. I do not hear this sound when idling, braking or on the highway. It is not a random or rough idling sound, it is a very systematic sound tied to acceleration.
I've checked the oil and other fluid levels, they seem okay. I've added "engine system cleaner" to the gas, but it did not seem to make a difference.
I would appreciate any diagnostic advice out there.
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