problems at 0.5/6 boost?
 

Hi all, iam getting a problem with the boost on my95 wrx it has a mines chip/equal length manifold/induction kit..what is happening when iam reaching 0.5/6/7 bar the car just judders in every gear? also the c/e light is on but i think its the lamba sensor could this have an effect? thanks

any ideas, cant find any leaks..but iam not sure i have the pipes on the right way on the 3 port boost valve can anyone do us a quick diagram on where each one goes. thanks.