2005 eveinrude e150fplso 05087392. For the second straight year my middle left injector has had the upper bolt shear in the head and torque allowing a space between the head and injector. Both times i was running down the lake at around 5000 rpms only to feel a hesitation and have the rpms drop to 4000. I have taken it back to the evinrude dealer that fixed it last time. has anyone else experienced this and is there an explantion as to why it would reoccur a year later? The dealer removed the old bolt and replaced it last year. I don't want this to happen again is there another fix that should be done other than bolting the same injector back down?