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Q: I have an engine miss, but no error code. on 1998 Lincoln Navigator

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my navigator has been in a local garage for a month now. I have a constent engine miss, but no error code is coming up. I have 88k on my navigator. I need some advise.
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Find a new shop, a month to find a misfire is absurd. Either it is a vacuum leak, a weak cylinder, an ignition misfire or a bad injector. These should take about 1-2 hours to inspect by a good tech. Also do NOT rule out carbon build up problems on the intake valves or a transmission problem that feels like a misfire.
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