Transmission/TQ converter vibration or lugging

[Jackpine]

I hate to ask an "obvious" question, but since you never say anything about it, I have to: When you are using the 93 Performance tune, you DO have the tank filled with 93 octane gas, right?

If not, the PCM is sensing detonation and is pulling timing to prevent engine damage. And, it "overcompensates", which means you might experience something like hitting the rev limiter.

- Jack