Low boost it happens highway 112kmph po299 low boost limp mode gear won't pass 4th even on sports mode when I reset complete normal my engine was rebuilt done 20000km new turbo injector check and good working order I use penrite egr and cat cleaner there was a improvement I didn't get a chance to do over 100 kmph is it fuel air ratio related or valve o2 cat egr map sensor or map filter related? Any thoughts ?