I have an '82 380 SEC and I can't get it to go! The car starts right up with no problem even if it’s been sitting for a week or two. The problem arises as soon as I try to accelerate. When I do the car simply dies! If I try to slowly push on the accelerator the car tries to rev up but quickly dies. The only other thing I have noticed that might be related is the "economy" gauge in the instrument cluster is always showing low fuel economy. It's usually a little bite pass the half-way mark. What to do?