GM Genuine Parts D1935E (12629472) Ignition Coil

I have 2006 Chevy Trailblazer, 200,000 miles on it, that was misfiring on 1 or more cylinders, according to engine code. I decided to change all 6 spark plugs and all 6 ignition coils at once. Took me 2 hours from opening the hood to taking it for a test drive. Performance improvement was immediate. 2 weeks later, family took it on long road trip and we were getting 22 mpg highway, with the air conditioning running. The original sticker toted average 20 mpg highway! Very happy with this product. (I'm sure spark plugs were huge part of improvement, too.)

When I was searchig for this product by the AC Delco part number I found it with this vendor. With their link to make sure it would fit my car it said it would not fit. It does fit because AC Delco said it was the right part number and when I received it the part was the correct part. The vendor needs to update their what will fit what part. Next confusion was also created by the vendor; shipping status. This vendor sends out nothing about shipping status. When I inquired I was given a shipping status over one month from the date I inquired. Luckily that status was also wrong because I got the part the in the next couple of days after that status was provided. In the end all worked out okay but the processs was confuising and irritating. Price was right and shipping ended up right. My car was a 2007 Hummer H3.

DO NOT BUY FROM AMAZON WAREHOUSE DEALS!!! They sent me 4 coils that were junkyard parts at best. I was replacing coils that had 100K miles on them, and the ones Amazon sent me looked twice as used. I reordered brand new ones for around $9 more, and they worked perfect. I had an occasional cylinder misfire in cyl. 4 and this took care of that. I replaced all 6 to be sure I didn't have a reoccurring issue with one of the other 5 coils. I would suggest replacing all 6 at the same time.

I purchased 6 of these for my Envoy XL because it was just a little over 100,000 miles and the Maintenance Scheduled said it was time to have them replaced besides the spark plugs. So since I was going to do the plugs I decided that at this price I would do the coils also. Since you have to take the coils off to change the plugs it was a no brainier. The only difficult part is not really the coil its self its just the amount of space you have to do the #6 coil in the back (toward the firewall).

Fast delivery. Exactly what I needed to fix my car.

Had a Misfire identified the cylinder with the issue, looked around for part it was either had to order with long shipping or way to high in price for pick up. Came on here found the part right a way ordered and here next day at an unbeatable price! Works perfectly in my 2008 Trailblazer!

Arrived in torn up boxes with dust and residue over the coil packs.

Highly recommend this product as it worked perfectly in a 2007 Chevy Trailblazer. I ordered six ignition coils and replaced them all in a matter of 30 minutes. They were much cheaper than purchasing from any other vendor I could find and they are OEM.There was at least one faulty ignition coil and the car has 140k miles on it. After replacement, the rough engine idle has been resolved as well as the A/C blowing colder without straining the engine while the car is idling at a stop light.