On the start problem, I would check the EHA. IT is under the air filter housing on the side of the fuel distributor housing. It is the small black box that has two wires attached. If it is at all wet with fuel or has any signs of leakage, replace it soon.
On the front end, we see where the sway bar mount bolts come loose or fall out. These are the ones that are on the front under the radiator.
1992 500E (very soon I hope
1981 280GE SWB
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