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What we are refer to as the dynamic MAF test (under load) is really a test of the entire fuel system.

A quick check on the MAF's is to spray some MAF cleaner on them. If there is a temporary improvement, MAF's are defintiely shot and are part of the problem. The opposite is not necessarily true.

As noted above, check fuel filter (although for the cost of the filter, I would just replace it at that mileage since it is the same labor). Also, if there is no proof the plugs have been changed (should be as part of Service II, usually occurring around 55k miles), they are due.

A Peake reader (a must!!!) will also help you pinpoint codes thrown from poorly performing parts, like CPS, even if no check engine light is on.

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