What is a p0600 and p0705 car very slow from a stop, 2001 ml430

P0705 is related to the shift lever selector, and P0600 is a networking communications code. This would need testing performed related to shift lever position and the sensor and wiring related. The P0300 and P0303 are misfire codes that need troubleshooting -- far more serious here and more related to your running concern. If left alone, damage to your exhaust and converters could indeed occur. But do not assume that - test, repair and retest for exhaust flow if sluggishness persists after all concerns that are setting diagnostic trouble codes are repaired.