1999 Mercury Sable misses

when does it miss? at idle? driving down the road? possible vacuum leak?

[quote:7240eaa796="lewisjp"]Engine Performance problem
1999 Mercury Sable 6 cyl Two Wheel Drive Automatic
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my car has a bad miss like out of timing and i have changed plugs and checked all vacume hoses do have any other ideas of things to check like maybe the oxegen sensor or anything[/quote:7240eaa796] it will miss at idle and has very slow pickup when driving

if the check engine light comes on then go to autozone and have it scanned and get back to me. they do it for free. did you install new plug wires?

I can attest to this very problem.
The Spark Plug wires are junk. Usually they rarely get replaced, and before you spend a fortune on new gaskets and other things, spend $40 on some new Spark Plug Wires.

What's interesting about this problem is it will sometimes cause O2 sensors to die. That is a pain in the A$$ cause the downstream ones are terrible to access without the proper tools, and even with those tools their annoyingly hard, cause there are 4 of them, and it's hard to access them.