Quit runnin

if this is a ignition setup that has been used for a long time i would have a look at the distributorcap and rotor they can go bad without you notising it very guick when they do wear out they do it quick..
if you find the msd parts expensive or hard to find i found that stock replacement typ caps and rotors for olderstyle chevy breakertype ignition systems works great for alot less money i bought standardmotors heavy duty replacements....