Mechanic changed plugs as part of tuneup. Tried 3 types of plugs (including original plugs in car) but in each case car engine misfired. Eventually reinserted original plugs and car ran properly. Coils inspected and all appear ok. What could cause this and is there some special type of plugs I should be using?
Thursday, November 15th, 2012 AT 11:55 PM