coil-on-plug

Started my vz v6 lumina drove for a little bit, car started running very rough and misfiring. Checked all areas for vacuum leaks, there were non. One by one I disconnected the coil packs while the car was running and found that “cylinder 1” had no change when disconnected. I than swapped coil...

Has anyone had any expirience with the VZ Coil-on-Plug units? Holden has quoted me $440 for each the units. $2640 to replace all !!!! Any alternate point of sales places?? Symtoms: "Check Auto Train" message comes up and traces of white dust are in one of the Coil pack channel leading...