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Old 02-27-2013, 03:25 PM
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My 3.7 idles fairly smooth, but many V6's have vibration issues. This is why the 3.7 has a balance shaft and the 4.7 doesn't even thought they're practically identical in other aspects. If there's no manifold issues found, I would look into the wiring for the #5 coil and injector or even a PCM issue.
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