On 1.6 16v bravo if you have checked the items the chap above mentioned have the injectors tested. Number 2 injector is the favourite for going down first.
Rachel
July 2007
First thing to check is the plug leads. With an end in each hand, gently try to pull them apart (I had the same problem on a Vectra and it was the leads). If they are all sound, then try removing the spark plugs one at a time and cleaning them. Check for black build-up on the contacts as that means a slightly more serious problem (usually wrong mixture).