plug life
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The plugs in the 99 should make it to 100,000 miles... But I'd say if you were to replace them you may bring back a little bit of lost performance... 
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I know I say this to everybody... Try the NGK TR55'*... They are a good plug for the price.... You might get 30,000 miles out of them...
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True Car Nut
Joined: May 2003
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From: Grand Rapids, Mi
personally im gonna buy the ac delco cuz ive had nothing but good luck with them or i guess i could by some of those perfomance plugs but they dont last as long right?
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Originally Posted by L27Buick
personally im gonna buy the ac delco cuz ive had nothing but good luck with them or i guess i could by some of those perfomance plugs but they dont last as long right?
You could get the AC Delco 41-606( copper ) or the Platinums that you should have in there now.... Irridiums... You could also use Rapidfire 14'*( I believe that these are all Platinum now ) I have used these in the past with no problems...]
You could also use Autolite 606, Platinum or double platinum as well...
All of these would be good plugs...
NGK makes plugs for AC Delco
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Joined: Mar 2003
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From: Purgatory
Originally Posted by jr's3800
I know I say this to everybody... Try the NGK TR55'*... They are a good plug for the price.... You might get 30,000 miles out of them...
I am on my second set, however. They are a sweet plug.
Jim...my factory AC Delcs only lasted to 55K. At that point I had to change the wires too.
