just beacuse the plugs look good doenst mean they r. spend 12 buck, get a cheap set of autolites and install and try again. ive seen plugs that look and test great still be bad. ill send u one to prove it if u want. test ur wires too. if u r now taking off like all holly hell thanks to a tune u may have had one sit one something hot or rub against something sharp. good luck