Check coolant temp sensor (not the inst. cluster one, the computer one)
Check idle air valve
Check for vacuum leaks

As to the fuel smell, check the gas cap seal and the rubber bib that seals the filler neck to the body if there is nothing more obviously leaking under the hood. Also, crawl under the back and check if the fuel pumps are dripping.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition