I would also jump in with ACDelco's or NGK's for GM vehicles. I've tried some other brands and they never lasted or caused weird misfires/idle stumbling almost immediately.
NGK is a pretty solid choice for most vehicle brands (most conventional passenger car and trucks anyway) and are easy to find and are cheaper for the most part.
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1999 Alero GL Sedan - 3400/4T45E
-HP Tuners custom tune in the works
-Hopefully much more in the works besides maintenance.
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