Have you confirmed that the catalytic converter isn't plugged? Does it get red hot when the engine is running for some time? Also, since you lost all that power, did the check engine light come on?
PLEASE NOTE: Since this new issue with power loss, I agree with you that an additive most likely isn't going to do anything. Let me know the answers to the questions above.
Saturday, August 29th, 2015 AT 7:16 PM