It depends on what gunked it up, but you can almost surely soak it out with a solvent of some description.

After that much IP work though, have a 17MM open end in your hand when you crank it up. If it runs away, start quickly loosening each line at the injector until it dribbles fuel then move on to the next one. This will shut it down quick enough to prevent any damage. Better carfeful than sorry.

BTDT!

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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