Question about 2001 Chevrolet Blazer

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2000 blazer runs rough and surges

Changed fuel pump. changed wires and plugs now it acts like it is only running on 5 cylinders. checked all wires and plugs they seem to be fine. found a vacuum hose colllapsed and replaced it.still runs rough especially when trying to take off. no power.

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Faulty idle air control valve or timing chain has jumped. So after you changed plugs it got worse? Better double check to see if the wires are right. You should also look for more damaged loose or cracked vacuum lines. Wiggle them all around with the engine running.

Posted on Jun 21, 2009

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How long have you had this problem? It could just be a bad tank of gas. Other things to check:
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