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Vacuum leak results in a leaner air/fuel mixture (more air than fuel).. Engine tries to fix it by adding more gas.. Results in extra gas dumping into the cylinders.. I assumed a fuel injector stuck open..

It might run fine cold, but once it warmed up, it ran rough and faulted with P0304 codes..

Now I just have to fix an exhaust leak.. Hopefully we are now finished.
 
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