Check engine light - Do I have a bad MAF or something else
 

I've been experience mass power loss at the 3/4k range, then it comes back on. This is at WTO w/ APR chip running 91 octane program.

Finally, the engine check light came on and I found these error codes :

17863 - Exhaust Gas Temp Sensor 1 (G235): Implausible Signal

As well as :
- random missfires
- cylinder 1,2,3,5 missfires

Any thoughts?
Thanks,
Reza

prolly you have a bad EGT sensor ..
 

my car was very slow when it had a bad EGT..
it could make a chipped car(with bad EGT) = a stock car.
Bring the car to the dealer and get them replaced it for ya :)

recenlty experienced the same fault codes, it was the egt sensor.

had same error codes and dealer just said i had some misfires
 

so they fixed that and gave it back, i still think it's the egt sensor cause its still slow.

I cleared the codes, and now have to wait for the problem to re-appear on the stock computer, but..
 

but how does a bad EGT sensor cause missfires?

-r