ENA Set of 6 Ignition Coil Pack Compatible with Chevy GMC Isuzu Hummer Saab Buick Trailblazer Envoy Rainer Colorado Canyon Ascender i-280 i-290 i-350 9-7x H3 2.8L 2.9L 3.5L 4.2L Replace# UF303 C1395

Great spark plugs. Worked on the first start up after the install

As Advertised

Shipping was next day for me, so it arrived fast. Took about a hour to install in my 2003 Trailblazer. After replacing the spark plugs “included” and coil packs my miss firing problem was solved. 1000 plus miles so far and still working perfect.

Great part easy to install

Short Story, I bought my Trailblazer the better part of a decade ago, it had about 204,000 miles on it when I bought it, still rocking the stock Delphi Coils which I assume where original to the truck, the whole time i've owned this truck I have gotten around 13.8-14.5 MPG (which is downright HORRIBLE and far below what i've seen other people say they get), the single BEST tank average, which was an all highway drive, was 16.5 MPG and I had NEVER been able to hit that again. I tried EVERYTHING I could think of, ran fuel system cleaner, changed Fuel Filter (done that twice in the last 40k miles), replaced Spark Plugs, even replaced the VVT Solenoid since it had Oil in the Electrical Connector (a sign of failure) and NONE of that gave me more then a tenth of a MPG increase. Fast forward to about 3 weeks ago, i'm out on a drive and when returning to town the truck starts feeling like it's misfiring, knowing how these trucks are known to leave you stranded on the side of the road from a bad coil pack I hopped onto Amazon as soon as I stopped in town to grab dinner and ordered this set of coil packs and then drove home and parked the truck for the next few days. Once the new coil packs arrived I installed them and took the truck for a quick "spin around the block", Not only was the misfire GONE, the throttle response was improved noticeably, so I decided to take the truck instead of the car for the vacation I was leaving on the next day to really put these coils to the test, well nearly 900 miles and 4 tanks of gas later I averaged 20.3 MPG HIGHWAY, the 2 best tanks of that 4 tank drive averaged 21 MPG, that driving was on relatively flat ground with little to no traffic and the cruise control set to the speed limit where the other 2 tanks involved moderate mountains and some traffic on the drive down. I can tell it takes less RPM to maintain the same speed than it used to before changing the coil packs, this Truck has over 246,000 Miles on it now and it gets 20+ MPG HIGHWAY just like they did when they where NEW, I am shocked at the difference these coils have made to this basically 20 year old truck. The only real question is how long will they last for and thats the only reason I can't give these coils 5 stars, I just can't vouch for how long they will last, i've got about a 1,000 miles on them so far, but at this point it's all GRAVY in my book, given the current cost of gas these coils have already paid for themselves in the fuel savings I have seen and they have solved the issue of poor gas mileage that has haunted me from the beginning on this truck, so even if they fail early they have told me what I need to do to fix this trucks gas mileage, if I end up needing to invest in a quality set of coils I will, or I could just buy another set of these to keep around as spares in case any go bad.

These are great

I bought the whole set even though it was just my number 2 cylinder that had a misfire. The OEM cost for the set of 6 was apx $400.00 when I was calling local auto part stores. Found these on Amazon, read the reviews and decided to take a chance with them. We replaced all 6 with this set, even though I just needed one. I kept the other 5 OEM ones for back ups in the future. These had my Trailblazer running like she should with no issues for months. Parts fit just like OEM parts. I was so happy I took a chance and tried these. Saved me hundreds of dollars!

They work great no problem at all

Tengo dos meses desde que se las puse, sin ninguna falla , se ven de muy buena calidad. Excelente compra. Saludos desde mty n.l.

Plug & play as it were, everything fit perfect & she's running like a kitten now. Quick delivery & great pricing.