I'm going to change out my spark plugs tomorrow. What kind of spark plugs should I get for my 03 SS 3800 serious 2 motor. Just won't to make sure they sell me right ones

 

nothing fancy, just get OEM replacement plugs.

 

Personally, I wouldn't get anything else but the AC Delco plugs. I bought those for my 2000 LS and they are going in tomorrow. Hopefully that will cure the PO300 code.

 

AC Delco's are the best choice. I believe these cars came stock with iridium plugs. NGK is another good choice (heck, so good, AC Delco sometimes re-branded NGK plugs). I've got NGK platinum plugs in a couple 3400s and my father put NGK plats in his 3800 Grand Prix. Zero issues.

If you are not in a rush, you may want to price them out via RockAuto.com. Locally the cheapest platinum plug for me was $6. I got 6 NGK plats for an average price of $3 after shipping.