Hey hopfuly someone can help me out i have a 01 Deville DTS with 80,000 miles and it has a slight miss at idle. i thought it might be plugs so i had the plugs replaces and it is still the same i have had the problem now for about 6mo. any help is appricated. Thanks in advance.

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SES light on? codes stored? Vacuum leak?

 

no light on, no codes either. anything else slowroll? thanks man.

 

A scanner that can read misfires and o2 would be very help full. As far with out one check plugs see if 1 looks different than than others, rust on coil tips, vacuum leaks, and heavy carbon build up at throttle plate.Cleaning injectors may help.

 

my scanner reads misfire and o2 and everything seems to be ok according to it. thanks
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What are short and long term fuel trends.Broken front motor mount?