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why is there a blue light coming from the side of my coil. my msd one did it so i put my stock one back on and it did it worse . should it be doing this or are they both bad
I wouldn't say they were bad, but it's arcing, which means the spark is jumping to ground (chassis) somehow. You've got a loose connection or damaged plug wire somewhere 'bouts.
do you think this is why i have a hesitation above 4500 . if it is it started after i put my headers on . ill have to check these tomorrow when i get up