hey tom, did you put the i.c. in your car or did it come with it, because on the non intercooled cars there is a relay(i think, either that or some other easily changable device) under the drivers side dash, up by the pedals. that monitors the boost level, on non intercooled cars it is set to around 9 psi, which could explain your problem because when it hits this amount it sets of the dash turbo light, and cuts the fuel. in the intercooled there is a different relay and that cuts it out at 15 psi, i dont think you can adjust it you just need to get a different relay, check out turbobricks.org they can help you too if this doesent answer you questions,