The turbo on our 453 had an odd moment . Left home and the car was fine , stopped for fuel ( 91 octane ) and proceeded on the drive , came to a mountain and felt no turbo action . Had to downshift to 2nd to make it over the mountain , car was just a 3 cylinder non-turbo motor . Stopped at the base of the mountain and opened up the motor access , I found proper oil level and checked for any loose connections or anything out of place , found nothing . Started up the car and the turbo was doing it’s job again . Put in a 230 mile day without one hiccup . Question is has this happened to anyone else , question 2 was this in relation to the blowoff valve being in an “open “ condition and bypassing any turbo boost to the cylinders ? Question 3 Is this valve electrically controlled ?