hi eveyone, i have a 77 camaro with a 305 in it. When running, it pops through the exhaust on cylinder no 8 only. Im kinda new to working on chevy v8's, but ihave the basic service manual and access to the tools needed to work on this. What could the problem be, and how can i narrow it down to the problem? thanks to all

 

maby the spark plug is takin a dump...idk im not to good at trouble shooting