i have a 06 ss sc and recently i got a check engine light p0300, i took it to a garage and it was "fixed." Driving it home it felt as is nothing at all was fixed. i took it back and they couldnt find anything wrong. i lost most all the power in my second gear, and the car seems to hesitate at 4000 rpm and right at the top of my second gear.

I am at a loss. i have no clue to whats wrong. someone please help?????

 

P0300 is random misfire what did they replace

 

I suggest taking it to a better shop. They clearly had no idea what was going on.

 

sounds like you need to do a leak down test to check cylinder condition

this is the performance section not the my car is broke section that section is located here Problems/Service/Maintenance - Cobalt SS Network post all problems here not in the performance section

 

Mass airflow sensor