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i have a 2001 mercury sable dohc had a 234 misfire to start off with change plus wires and coilpack ended up with 456 misfire and changed all again with oem both times same thing had a back pressure test done on cat its good.what would cause these issues with the car only having 91000 miles on it.also car wont go over 15 mph either.
 

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it kinda sounds like a couple of spark plug wires are crossed.

There's also one thing to check.. under the throttle body tube there's a vacuum hose that needs to be connected. if it isn't, the car exibits the same symptoms.
 
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