Yes i am having trouble with my em1 it is a fully built turbo gsr car is tuned and has s300 also running 2200 cc injectors and 650 pump car is running lean i will be driving the car normal no boost then all of a sudden the car starts going to 15 to 17 trying to cut out but car idles fine i adjust the tune smd it still does it charged the battery haven't checked the alternator since the shop that built the car told me to check all that stuff any advise will be helpful pump and injectors and fuel system is all brand new out the box and work fine until one day