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Sea Foam is far from snake oil- it is indeed an excellent product for older engines with some wear on them. Especially pre-emissions control engines which are all carboned up, or for most two stroke motors. I use it in my outboard motors- it is a wonderful product. Carbon deposits in the combustion chamber tend to stay really hot & can cause pre-ignition. And when rings get carboned up they stick and you lose compression.
But I too doubt that it will help your situation unless you have run it way to rich way too long, in which case your catalytic converter might be unhappy as well. This is unlikely. When was the last time your spark plugs & spark plug wires were replaced? And rotor/distributor cap if your car has them. Start basic, then go from there.
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