chevy short wide that i just put a rebuilt 350 in. i noticed sparks coming from the ends of the plug wires. i changed the wires and cap but it is still happening. anyone have any recommendations? it has also been running rich, i adjusted the idle mixture screws on my edelbrock carb but cant get it right. it is causing it to run sluggish and almost dying at stop lights. sometimes when i give it too much gas it cuts out. any help would be appreciated