big miss or misses

well it did not fix my problem, the plugs made it worse actually, it is dark and i looked at the plug boots and 4 of them were glowing blue and when revved #2 plug arced the block. do you think i may have made a hairline crack in 4 plugs to make it do this. it is misfiring badly especially when flooring the pedal.

no i have brand new wires as of yesterday, they are a cheap brand but work good. i found out that i may have put cracks in the 4 bad plugs, i replaced them and it runs better now but still a piece of junk. no i am confused about this motor. i have the 95 or 98 intakes on it now but the motor is new from the factory built in 2000 but i guess since split port heads won't bolt to a single port intake that they are not from 2000 but the valve covers say it is a year 2000 shortblock and buy parts for the year 2000. maybe the people that i got the motor from changed the heads off of their 98 and then used to 2000 valve covers. i know the block is a 2000 because it has the balancer shaft. but isn't a shortblock without heads.who knows. i have a crappy car. i have no codes now, that is a first in over 8 months and everytime there are multiple codes and different everytime too. even when i did nothing to fix it. would this be a bad computer.