Hi,

I have a speed gtc 2011
I'm having problems with the power. It also has a hiccup when accelerating,
I've had a GAS sensor for bank one, mass air sensors and a new battery. Each time something new is put on it's ok for a day or 2 then goes back to driving awful again.
Has anyone had this problem accur and if so what cured the problem

Thanks,
James.

 

Have you done an engine smoke test to see if there is an air leak?

 

Are there miss-fire faults?

 

....what did you eventually determine cause of erratic power....JimB