Do you feel low on power? When was the last time you replaced the fuel filter?

I had (still have) a power issue, along with poor mpg. dropping a bottle of redline fuel additive helped a lot.

Intermittent problems suck.. They get expensive too.

My last guess would be to change injectors.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2