engine was chugging; got worse and engine light came on; mechanic said computer said coil 1 misfiring, replaced coil 1 and 6 spark plug (expensive plugs); still chugged a little; chugging getting progressively worse; tried gas treatment, and then seafoam too, but no effect; no engine light but chugging getting worse and now happening almost all the time; mechanic is stymied cuz computer reads no problems.
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