My car lost its zip. Accerlerator is soft. Even tuned at AMS, the numbers are good but the zip it once had is gone. 270 hp 290 torque. Maybe one morning a month the car will start and be wound up tight again but it only lasts for 2 minutes until the car warms up. Then it loses 4 psi of boost and is sluggish again. All efforts made by shops and myself are just masking the real problem. THis has been out there before but im still stumped.