Fuel trim issues

[Sinex 1]

I have a 2g talon and I have a CEL code saying fuel trim. When I get into high rpms or over .5 bar boost it cuts out. I've read fuel cut pages here but not sure what could be causing my issue. I haven't had this car that long. Guy didn't know much about what was done to this car. All I can see is intake, exhaust, turbo timer, after market boost gauge, manual boost controller.

 

[pauleyman]

Well you need to do at least some diagnostics? What have you checked?

 

[Sinex 1]

Code reader P0170 and I checked the hoses. They all seem good. I have a crack in my valve cover. Could that be the extra air causing fuel trim?

 

[boostdawd]

Even though the cracked cover may not be the cause of the issue I would still address it. U don't want leaking oil splattering everywhere. Also seeing what parts your car has exactly would be beneficial. size injectors, fuel pump, way of tuning, etc.

 

[Sinex 1]

Stock injectors, stock turbo, intake and exhaust. Stock intercooler.

 

[boostdawd]

http://www.dsmtuners.com/threads/p0170-code-etc.430737/