Just took my car to a car show yesturday and ran fine. Come out this morning to start it up and it starts up and then about 30 seconds in it misses a lot and at idle the rpms jump around from 500 to 1000 rpms. This just started out of the blue. I have an MSD ignition box 6A and the blaster coil and MSd distirbutor. Im getting enough spark because i did the test. Im getting fuel as well so i have no idea what in the world is going on. Car gods must hate me or something. Any ideas?

 

check your vacuum, seems like that would do it.