ticking noise

[Vincenzo Basile]

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Hello list,
I have two questions ,First:after start up maybe 30 sec. or so my car seems=
 to make a intermittent ticking noise that doesn't seem to go away for a fe=
w (don't know exactly) minutes or until i actually go for a drive.What coul=
d this be, manifold,valves or maybe something else? How do I find out?
My second question is my car really smells like rotten eggs after hard exce=
leration,could this be the start of cat problems or something else?
                                                                   thanx in=
 advance for help
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