My 89 740 Turbo Wagon, suddenly dropped from running great at 70mph to choking on the side of the highway going 15-20. I pulled over and didn't see anything obviously wrong. I limped it along the side of the road for another 10 miles to town. There was no power, it sounded like it was choking for air, and I heard some load craking sounds a few times. When I got it to town and took a closer look, I found a large tear in the 3" dia. air hose leading into the intake manifold. I duck taped it and put a clamp over the hole for a temp fix. Now...it just won't start. The engine turns over, it catches, but then immediately sputters and dies. Might I have done some damage to anything else by driving it this way for 10 miles? Any thoughts?... Thanks.