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Mechanics kept telling me to not change my plugs yet , because they were the OEM iridium type. It was really hard to change spark plugs and spark plug wires in my 2002 Lasabre, but I followed multiple You Tube presentations on it, and managed to get it done. Although the old plugs didn't look that bad, the car engine runs smooth like a sewing machine now. The performance is noticeably better, with acceleration especially. I also put in a new air filter and will put in a new fuel filter soon. I'm NO MECHANIC, but even low I.Q. people like me, with You Tube and patience, can do this stuff. My mechanic wanted $200 to do it, even though he didn't want to do it. The next time it should be a lot easier because I got it figured out better, and I also bought specialized spark plug wire pullers ($10.00), and put dielectric gel ($3.00) on the spark plug threads and ends, which is supposed to ease removal next time. Maybe I can get 250,000 miles out of the Lasabre?
When it comes to GM's waste-spark ignition system, these are the plugs to run. In this ignition system plugs get fired twice per revolution so it's important to run a high quality iridium plug. This is the OEM plug for many GM products and run especially well in the 3800 engine. If you want longevity out of a set of plugs look no further than these. They're actually rebadged NGK 5599's but priced about $2 less than the NGK-branded ones.
These plugs have a platinum pad built into the ground strap, without it the plugs form a dish after some time due to spark erosion. This doesn't happen with these which help give you that 100K mile service life.
If they fit your vehicle use them, you won't be disappointed.
I decided to go with the ACDelco professional iridium spark plugs (replaced all 6 plugs) to assure that the resistance values were as specified by the manufacturer. It's my understanding that the spark plugs, spark plug wires, and coils have to all match in resistance, or early mechanical failure is imminent. So I replaced all three items with original ACDelco parts. More expensive, but the car runs so good.
Got an older vehicle here, and it needed new spark plugs. Kept noticing a little jolt/jerk sensation on hills. Considered many things, but ultimately decided the plugs must be going bad. Put these new ones in, and the vehicle runs much better now. Very smooth and no more jolt/jerking on hills. Even if your plugs are supposed to last 100k you might want to change them earlier if you're getting close to that point. Also do the plug wires. After I put new plugs and wires, all problems left. Makes me very happy. I'm satisfied and would highly recommend these AC Delco spark plugs. Sometimes they run some good rebates too!
Great OEM plugs for the GM w-body car with either the N/A 3800 or the SC 3800 engine in it. Iridium is the best tip plug one can buy, for many reasons. These are rated for at least 100k miles. I put these in my N/A 3800 and they work great. I'd recommend these over aftermarket iridium plugs. These are the OE plugs that were installed at the GM plant when your car was first assembled.
Installed on 2004 Pontiac Grand Prix GT1. Bought the car for cheap and never got around to doing a tune up. I replaced the wires with ACDelco as well and it runs great. It was originally misfiring (I think it was 4) at any rate, it generally missed going up hill or under a great acceleration. That is now gone and I am happy.
I have also use these plugs on a 2005 Impala 3400.
Edit: Installed on my 2005 Impala when I purchased the car with 60K miles - now has 210k and they were starting to act up a bit. Replaced with this same spark plug on my Impala and it's purring again like it did before.