Review on Enhanced Performance: High Performance 8-Pack Straight Boot Ignition Coils for Ford F-150, Lincoln, and Mercury V8 V10 - 15% More Energy - DG511 C1541 FD508-Upgrade (RED) by Roger Alexander

There must have been two or three spark plugs that were not working properly. In my 2008 f150 the service engine light came on when rapid acceleration was required. Everything changed with the replacement of candles and coils. Drives like new again. Even a little tick noise I've been hearing for two years has been removed. official difference. It's been two months and everything works fine. Best thing I've ever made for my truck!