Set of 6 Ignition Coil Pack and Spark Plugs Iridium Compatible with 2002 2003 2004 2005 Chevy Trailblazer GMC Envoy Ascender Bravada Buick Rainier 9-7X 4.2L L6 Spark Plug Coils Replaces# UF303 41103

Product comes very well packed and is a good solid product I was very impressed and the price fits my budget being on Social Security

Worked beautifully and the vehicle runs better than ever

Everything was of good quality

Fit perfectly. Noticeable difference immediately

Initially, before this purchase, I had a misfire on cylinder #4. I decided to replace the whole set instead of just a single coil. I ordered and installed this set of 6 coils and spark plugs. After installation, the vehicle ran fine for a little over a month before developing a misfire on cylinder #6. I switched the coils of #6 and #5. The misfire moved from cylinder #6 to cylinder #5. Indicating that the new coil has already failed. While this set was cheap, my expectations were low. I didn't think they would start failing already.

Installed them, now I've got a new car. Very happy with them.

Part is A1

Pretty easy install, just watch the YouTube video. The ones that are closest to the cabin are the hardest to change