I have been sweating for the last 2 weeks frantically doing searches trying to figure out what is wrong with my car and i have read about several people that have a ping or knock or whatever you want to call it when the car was under a load and that is exactly what my car was doing

Finally last night I disconnected the hypertech power modual and took it out and that fixed my stumble & knock and my ses light
( light was for low MAF voltage )

I think this unit cause the car to go lean and detonate but that is only a guess

But the main point is that these units do not make any power difference and are not worth the time or money

I just thought I would share

 

further more proof hypertech sucks elderly elephant *****...