I have an 87 GN and I have a small problem, when I am easing back on the throttle and have boost ( doesnt seem to matter how much ) the car surges and the boost jumps up and down. It doesnt do anything wrong a WOT , but when I back off slowly it starts freakin out. If I stop and hold it steady some times it continues to do it some times it smooths out, and if I drop back far enough it quits doin it also. I've looked at the cam sensor and it "looks" fine, I checked the tps and it is within range I cleaned the IAC but did not know how to set it, could this be a problem with it? thanks in advance sorry about the long post