Have been working on this for a few months now. My 2011 HHR 2.2LT has had new timing chain, sprockets, bolts, water pump, coils, injectors, MAF sensor, Cam sensor, gaskets, you name it done. It is still running great at 50 to 55 not a miss but as soon as you stop it won't idle. It stalls, jumps, and dies. What suggestions can you offer? Thank you. P0300 is the only code. It also has check engine light that says service ESC and Traction Control.

 

I would check the MAF connector, then do a compression test.

 

Did compression test and changed MAF twice. Checked the conections. Thank you.

 

Have checked all that everything is okay there.

 

Did the compression test and cleaned the MAF connector and no change.

 

Compression test does not fix anything, it is supposed to supply information.

The misfire is the cause of the ESC and TC messages.

 

The numbers are a secret? I'm getting tired of pulling teeth , now.

 

You don’t mention changing the cam VVT solenoids . Did you ? Replace them?

 

Maybe test the fuel pressure

 

changed cam vvt solenoids checked fuel pressure 60 lbs and Compression pressure was 150-154 in each injector