I have a 1.8 petrol as well and I used to experience the same thing after I bought it. But first of all, are you experiencing slow start or slow crank? In the case of a slow crank I would suspect the battery and battery terminals.
if the crank is solid but it simply does not fire up, or it starts with very low revs (400rpm) it might have to do with a dirty throttle body and overall a dirty inlet manifold.
What I did to fix the problem was the following:
- replace the air filter
- clean airfilter housing
- clean throttle body
- wynns petrol cleaner
it does start every time on the first attempt now. If it does not work for you, you might want to clean the TMAP sensor as well which is located underneath the plastic inlet manifold. A little bit hard to reach, but you can find a good video on youtube how to locate and clean it. (search for: duratec HE TMAP)
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