thanks redorange.am tryin to search the net now but it seems like there has been no posting yet re recall of acdelco 43xls plugs. but the other branch of rapide said that they've stopped using that since 2005 since they've encountered several probs with the same plug.mine was installed feb 2005. most likely the one installed on my car was part of that batch that has product defect.my concern now was that they(Rapide) should have informed their customers who already had the defective product and have it replaced accordingly.