i own a 2000 toyota landy with 100k miles...a couple of months ago a check engine light came on and the truck idle/drives like crap..so i scanned it to find out it was a misfire cyl #7 so i replaced it with new coil plugs and the check engine was gone and drives great...Now it started doing it again but now its giving me multiple misfire cyl # 6 & 7 so i replaced #6 since i already did #7 a couple of months ago...so code #6 didnt show up only #7..WTH! So i swapped coil #6 to #7 being that #6 is newer...It didnt matter i still got the code misfire cyl #7...can somebody plz tell me what else to check? oh both the coils are Denso from toyota dealer....

 

My 1999 LX470 had cylinder number one go bad a few months back. Don't pay a dealer to fix as it took less than 5 minutes. Cleared code and it runs perfect once again!