10 years and you put Venom injectors in you Z! A "search" would tell you what knowledgable people think of them. Take 'em out. It's just that simple. Just take them out and put in some stock injectors. Assumiung you've learned by now how to install them, you problems will be over. ... I put Venoms in my Z before I'd heard of this site, had the same experience you are having. Luckily I stumbled across Pitstop, who informed me of my mistake.