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Q: RUNS ROUGH IN IDEL,SOMTMS BCOMES LES WHEN AIRCOND. IS ON, HOT OR COLD RUNS ROUGH on 2003 Mercedes-Benz E500

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Q. 1)Car runs rought (HESITATES) in idle, sometimes smooths out after driving, usualy it dont. It does little less hesitation in traffic light idle. Sometimes it smoothes out after turning the airconditioner on, however the dealer chkd compression test ok, no chk engine light on. Car starts right away. They think it a gas issure that's used in winter & was told to try end of june gas. They also think it could be a leaking valve or FI (cleaning). The compression test was very good. I used Techron & Lucas didnt help. changed gas stations didnt help. did tunup, air filter didnt help. they said the hesitation is not from fuel pump. I do have a slight leak from R-Valave Cover. Accelaration is good????? please let me know.
Q. 2) Noise (clunking) from R-Upper Rear Shock area, over small bumps: lower R-R suspension components are very tight. HOW DIFFICULT IS IT TO REMOVE THE R-TRUNK PANNEL FROM THE INSIDE, SO I CAN SEE WHETHER IT'S THE UPPER SHOCK MOUNTS OR BUSHINGS OR IS IT THE AIR SHOCK. HOW DIFFICULT TO CHANGE THE AIR-SHOCK??
ANY HELP WOULD BE GREATLY APPRECIATED!!!
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