am havin sum bother wi my 78 vette spark transfer.a yellow accel points coil feeding a mallory mag.br,less dist. on when i got it,lately it has died on me and wont start at all just floods,tdc confirmed at dist tower #1 and all leads in firing order the spark emitted at the plug electrode is a yellow orange not blue as prefered,is this a sign that the coil has given up? 