how did you wire it?
if it was a speed density mustang from the factory all you needed to do was chop of the egr plug and extend the wires to the vane air meter then add a single wire and a switch for the 87/94 octane selector switch my guess if its eating ecu's is the octane jumper is wrong I fried one by being one pin off on the jumper
+1 you need to check the pressure with the car loaded up and at whatever boost it goes lean....
what is stock boost on a volvo? 5-6psi you might be out of injector
http://www.pringles.com/pages/index.shtml
ok listing but they only have the flavors that are out everywhere columbus is a test market for pringles so they try out all kinds of weird flavors here