We recently replaced spark plugs, head gasket, hoses, coils, and cleaned everything; flushed coolant, oil and replaced filter plus have a new thermostat. When started car everything seemed fine, there was a little smoke at first, but went away so figured it was from burning off paint, cleaners, etc. Idled just fine and left house to test drive....which is when we discovered it has almost no power when you accelerate and is also making a sort of deep, chugging sound. You dont hear it when idle only when start to drive. What is going on now? Please any advice.