C5 Tune up
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
I kept the coil packs,Delco Iridium (I gapped .040 For my 2000)And I used MSD wires,mainly because they were available on short notice. Really woke the car up. MSD some love them some hate them ,for me so far so good. GM reds also good I'm told.
Le Mans Master
Joined: May 2005
Posts: 6,366
Likes: 249
From: Fort Lauderdale, Florida
There really is no reason to change the coils unless you're having a problem. I've used MSD wires with no complaints. At your mileage any plug is going to make an improvement. I've used Bosch +4's with success.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Spark Plugs ... AC Delco 41-985 (they come correctly pre-gapped at 0.040 inches)
Spark Plug wires ... GM Performance Parts kit (GMPP) part number 12495519 (all 8 wires in the kit - wires are red)
Your coils are fine ....
I'd also recommend you replace the serpentine belt and the A/C drive belt if they haven't been done in the last couple or 3 years.
New oil and filter should be considered also.
Spark Plugs
