CARS!!!!

This is my husbands car, it hada new engine fitted 3weeks ago, seemed to be running fine. We have only done short trips like advised to give it time to settle in, well today we decided to take my nan shopping half hours drive from home...... just as we got to retail park the car starts billowing smoke from exhaust and engine!!! NOT GOOD!

me and nan went shopping anyway and left hubby with the car on the phone to our mechanic back home. Well he told hubby how to do a quick fix to get us back home and to him (hes on his own today so cant get to us). Well hubby did as mechanic said and it got us back but not as far as needed as it died a 2nd time. At least this time close enough for mechanic to shut shop for half hour and get to us. He came and did another fix to get it to the garage so he can see what is going on!