My friend has an Ls/Vtec engine & asked me to post this up for help. If theres any extra info needed let me know & ill ask him.

" while driving my car , the RPM needle bounce's spiratically, the
car also feels like its cutting out for a quick second. My car also turned
off on me while @ an intersection so I'm not sure if it has something to do
w/ spark or what? I just changed the spark plugs so those are new ...please
help and let me know if anyone has encountered this problem."