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mustang miss under heavy load

Car: Ford, Mustang GT, 2003, 3.8     -    Back to Fix-It    -    Ford Repair Manuals

Q.what could cause under heavy load, eng. miss?

I already checked/done: replace cat. conv. spark plugs, wires, had p0303 code

Answer Did you by any chance check your ignition timing?
That's where I would start at least.

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