i installed a used MSD 6A a few weeks ago. works great. this afternoon i was messing with the shifting linkage(other side of engine bay) went to start the truck...nothing. after some head scratching i check the inline fuse to the main power for the ign. box. throw a new one it and fires right up. as soon as i blip the throttle it dies.fuse again. i do this two more times and everytime a blip the throttle it blows. it'll run while idleing tho. what the heck could do this? i didnt touch any wiring. any ideas?