My 1990 240 with 155,000 miles on it has suddenly developed a reluctance to start when the weather is hot- 80s and above. It seems to not be getting sufficient fuel during startup, as giving it a little gas gets it to start. Idle is a little lopey for a few seconds and then evens out, sometimes revs highly for a few seconds. At 65-75 degrees, it starts normally. I checked for fault codes: 1-1-1 so nothing there. All the vacuum hoses seem to be OK.
Recent work done on the car was replacement of AMM and airbox thermostat 3000 miles ago, replacement of master cyclinder, and 4 new tires. The car ran superbly after this, until about 2 weeks ago. Other than the starting problem, the car runs great.
Any suggestions as to where to start looking? Thanks!