i got these to fix rough idle on my 99 Tahoe 5.7. I go through caps like crazy and i hoped these would help. after reseting the iac wiping the PCM gave it a wirl and was amazed for About a drive cycle it was like a brand new truck i was in heaven and then the misfires came back at idle no other problems. seriously every sensor replaced every test run every weekend under the hood i cant figure it out and was gonna say EMI if these wires worked but its something else i guess. the wires do what they do i dont see any reason not to recommend them :)