My Impala was shaking and on the verge of a nervous breakdown so I looked for the cause. It turns out that even though I replaced the candles as well, it doesn't wobble much anymore and is now working smoothly. I had a hunch it might be the fuel pump before ordering these coil packs, but I'm glad I didn't go down that route (I did the fuel pump just in case). Of course, you may have a different situation and always investigate as many problems with the car as possible, you'll thank yourself later. If you are using a 2004 Impala 3.4L V6 you will also need a 18 foot socket to fix it. Fast shipping and so far no kinks with spools.
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