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Message: <blockquote data-quote="scott degroot" data-source="post: 981479" data-attributes="member: 66039"><p>As others have stated the blinking cel is a catalyst damaging misfire.  The clunking noise and misifre happening at the same time is the concern here. Could be a few things and a timing chain wouldn't be an unreasonable assumption but should also be VERY easy to diagnose. Whatever it turns out to be do not get any of the leaks fixed until you are 100% sure on the casue of the misfire and clunk. If it is a timing chain issue be prepared to dig deep into the piggy bank to fix it, your mechanic also needs to be aware that he needs the special tools to set up the timing chains, 3 of them, on this engine...there is no way around it. When I do timing chains on these engine I pull the engine, it makes things alot easier when it comes to doing the chain on the rear of the engine.</p></blockquote><p></p>