520i starting problems

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I have a '88 bmw 520i, and i have some problem with the starting, but not all the time. In the morning it starts ok, when the engine is warmed up it starts also ok, but when the engine is stoped for about an hour or so i have to try 2 times before the engine starts.
This is a daily problem....Please let me know if you have an answer to this at lightsistems@yahoo.com

[632 Regal]

How does it run after it starts the second try?

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It runs perfectly, everything's ok. I've bought the car in march and the previous owner told me that the car has been doing that for a long time and nobody seems to know why. I took it to a computer and they told me everything is ok.
You can see this is pretty anoying... I'm open to suggestions.