Installed colder plugs before going in for tuning at Cob, Gapped the to .024. Now after cruising for sometime, when I go WOT I get a series of misfires up top. This happens usually only once as afterwards the car pulls just fine. Only thing I can come up with is either the plugs aren't hot enough for my setup or the tuning is off and its running really rich. Any input? Plugs are ITV22's