hey everybody, I posted on here not too long ago about my HHR I had bought and was having problems with, and after cleaning the MAF and MAP sensor and the throttle body, and also replacing the spark plugs, the car was driving fine, just shifting slightly harder than normal. Now when I was backing out of the parking lot at school today, the engine died twice before I could back up enough to go into drive and get home. It only dies in reverse. Any ideas on what it could be exactly? The "REDUCED POWER TO ENGINE" has shown after I cleaned the sensors but hasn't since then. It's been just a few days since I fixed it. Codes P0102, P0068 and P0107 are thrown currently. 

 

Dirty Air Filter or faulty MAP sensor.
Just my 2 cents worth, what I would check first

 

X2 ^^^^^^

 

Did you forget to plug the electrical connector back into the MAF sensor?