I've had an '87 560sl for about 1 yr. now.It got stored away last winter and I put about 500 miles on it this summer ( it now has 87000 miles on it). After the engine gets hot it is difficult to restart the car without pressing the accelerator while cranking the engine. It starts right up but I must give it gas. Once it cools off it starts up easily whithout giving it gas. Is this normal? It did not do this last year. Any advice would be apprecciated.