Unit has almost 80k and original plugs. It's been running alittle rough lately and I'm wondering what's causing it. Special plugs for this thing?

http://isuzufaq.ibctech.ca/#faq15

yes there are certain plugs to use.

Careful with the plug boots!

Thanks for that FAQ Amigo, I'll get those Denso plugs and get r dun. Sounds like you should do this when engine is cold? thanks agin

yup, cold is the way to go since it is screwing into aluminum.

Just remember not to overtighten the plugs..... Can turn a simple job into a real nightmare.

-Scott