Injectors and their seals are a good place to start. I would also check out the cold start valve and it's relay. The valve may be leaking or supplying fuel when the engine is warm. Do a search - several posts on this.

Other possible culprits are the warm-up compensator and the control valve in the fuel distributor, but testing them is more complicated.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe