maddrsparks73

Don't know if anyone has replied to your question, I haven't read all the comments below this point yet. I purchased the Pulstars for my 2015 5.3 and installed them in Oct '25. I DO NOT recommend. As soon as I started the truck, it nearly died from misfires, and I immediately shut it down. I disconnected all my wires (brand new AC DELCO) from both ends to make sure I didn't misalign and not get a good connection. After reconnecting all my wires and before starting up the truck, I plugged in my KINGBOLEN EDIAG Bluetooth scan tool to get a live data feed so I could see which cylinders I needed to focus on. Started the ECM MODULE>MISFIRES>CYLs 1-8 live data feed, started up the truck, and immediately had 3 misfires - 1, 6, 8. Let it run for a few minutes, as there was nothing "knocking", and had a continuous misfire on 1, 3, 8, and 6, 7 were intermittent. By the time I shut off the truck, I had like 36 DTC's ranging from all 8 Cyl misfires, 3 Cyl Knock cutoffs, Cam Pos Snsr, Crank Pos Snsr, Stabilization, Traction Ctrl, ABS, HMI INTERFACE, Radio, and on and on. I yanked those plugs out, went to O'Reilly's Auto Parts and bought NGK Iridiums for $4/sparkplug cheaper, installed, and the truck cranked right up without a hiccup. Sent the Pulstars back and got a full refund. The full refund was the BEST part about those plugs.