I just got these 2 codes pending on my car, while crusing at highway speeds. symptoms are loss of all power, and no boost. just changed my plugs and it did it before and after I did this. it also flutters and surges.
Any ideas please help

 

Oh and when i turn the car off, pull the key and restart its fine!

 

maf sensor and map sensor,check to make sure there connected and have no shorts.

 

Thats because when you shut the car off it reset the computer. I had the same problem when I was running a bov. Depends how yours is hooked up but on mine because the pressure went to atmosphere, they would kick out due to NOT enough air flow. Try this... drive the car for 20 mins and when your not on the throttle make sure your clutch is in ( no deceleration in gear) and see if your boost kicks out or it threw codes..