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The noise is likely an oil related issue, likely an oil change will help. Use only filters with anti-drain back valves, like the A/C units, or other name brand types. I would also recommend using a name brand oil and change it more often. I strongly recommend synthetic oil for its engine protection properties. The miss and tach issues are likely related, like a cam or crank sensor. The year model you describe was a pivotal one for these sensors, and they weretroublesome initially. Ray
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