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1999 Lincoln Navigator Question: navigator shakes at stops and accelerations..

 

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domdiva, 5.4L V8, Littleton, CO, December 27, 2010, 09:41
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Coming into N.M. my check engine light turned on, there seem to be no issue, but wanted to check it out.
I took it to goodyear in alburquere, did diagnostic and said they need to fix a small pvc valve on the vacuum hose and #2 spark plug and coil. the light went off..continueing towards Taos, my suv started to shake at stops and as i accelerate and sometimes as i go past a certain speed. Its worse than before i took it in to goodyear. In May 2010, i had a aurora goodyear shop fix all coils and plugs..would a plug/coil go out so soon?
What could it be so i am aware of the next "diagnostic" test with another shop?

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