Has about 186,000Km , when the outside temp is around 14 Deg C, drove it for about 30miles, and after 30 minutes try to start it, it does not strat in one click, takes few clicks and had pedal the gas- Is it with MAF, Oxgen Sensors Problem or My tune Up is due ( did about 50,000Kms ago), How many Oxygen sensors are there and where are they located?

Pl. help so I can fix it over weekend.

Thanks,
Alka

I would start with a tune up and go from there. It is due anyways. Do the plugs, air\fuel filter, clean the throttle body out very good. And get a good quality injector cleaner. Spend like $30 or so on a can. Here is one made by Wynns.
http://www.wynns.ca/data/infosheets/english/63401.pdf
You may have to go to your local shop to get the Xtend version which is better than just the wynns. I have used this product for a few years and it works great