Just had work done on my 1993 500SL to address unstable idle speed. My technician replaced leaking vacuum hoses at throttle body and small diameter vacuum lines as well as ignition wire set, and alternator. But when it came out of the shop, it had a new problem that baffled my technician, who has always been top-notch. Now, transmission shifts to each gear only after letting off the gas at appropriate speed and tac revolutions. It's similar to driving a straight stick, but without a manual shifter. When we put the pedal down, we want to go, not let off the gas each time for the next gear. Never had this problem before. Is it the transmission, or something else? Any suggestions on what the problem and solution might be?