hard start

[nita]

hi would anybody out there know why my 1983 230e 120980 engine is hard to start when it has been running for a while, it starts first go when cold, i had new injectors fitted not long ago and now it seams to start first go when cold fast idles for a few seconds then the revs drop to 750 runs like a dream but after driving for along time parking then trying to start it takes a fair few goes to start it but it does start? :roll: leo