Paid Evolve to upgrade ECU (actually done by Powerchip) and have had problems from start. After initial issue involving idle (which required me to send ECU to Powerchip second time so they could exclude everything below 1000 rpms from re-mapping), ran fine for a couple of days and then started experiencing loss of throttle response, especially on hard acceleration. Exchanged many emails with Powerchip as problem progressively got worse. They are convinced it is air flow sensor problem, not ECU. (Apparently it's not all that uncommon for sensors to fail after ECU upgrade, which I didn't know.) So paid $244 + shipping for new Bosch sensor and installed it. Problem improved but didn't go away completely. And now (after about 100 miles) I lose throttle response about every time I step on it (at about 3000 rpms). Local Volvo shop says it has had issues with Bosch sensors and they only buy from dealers. Dropped it off tonight with local shop to see if they can get to bottom of it. Has anyone had similar experience? I searched archives and didn't see any discussion. thanks.