Hi after a engine head replacement ..the car is not running properly upto 2500 rpm...it does not accelerate fully.. Engine stalls. But after 2500 rpm car runs properly and with full acceleration. The sensor light is showing but this was not the case before the work. Car was fine. Can anyone identify this issue ?

 

"The sensor light is showing."
Are you referring to the engine light?
If so, get the codes and post back.

 

Dont have the codes...it just shows the engine light. car is having tuff time 0-2500 rpm... maybe its the idle air control valve issue ? or the o2 sensor ?