Volvo: Volvo 93 bucking and losing power a2 code 113, mass air flow sensor, volvo 850 glt

Question
I have a 93 Volvo 850 GLT that keeps bucking when the car is on the hwy going uphill (4000 rpm's or 65/70 mph) and losing power.  I'm also getting an A2 code of 113.  I've replaced the Cat, I use 93 octane gas, cleaned the injectors with techron.  Any resolution to this problem would be greatly appreciated.   Thanks  

Answer
Kevin,
Code 113 is Heated Oxygen Sensor signal lead short-circuited to ground.
Heated Oxygen Sensor faulty.
Contact resistance and oxidation in Mass Air Flow Sensor connector.
Mass Air Flow Sensor faulty.
Fault symptom(s)


Fault may cause high fuel consumption and driving problems.