Has anyone had anything like this? It seems like when the temps are warm or when the himidity is up my 1984 300SD is real sluggish no acceleration no pep at all. When the weather is cool and humidity is low she can keep up with all but the most aggressive gas cars. Is there a sensor on this car for atmoshperic conditions? As I said this is a 1984 300SD with approx. 180,000 miles. Any ideas? My fuel mileage is also lower than I think it should be at around 14 mpg.