Put them in my 2000 Chevy Silverado 5.3L. The truck now works like a spinning top. To be fair I replaced both spark plugs and wires. So I'm pretty sure a combination of all three did the trick, but my truck wobble pointed to the ignition coils. They were very easy to replace (most of the tails sucked) on my truck. Be sure to check the engine bay to see if you have round or square coils.
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