I will be arriving in Newark from Brazil next february,08th.I will have just 1:40 hs to go through passport control and customs,before the flight to Orlando my final destination.Is it time enough to get it ?

That's really close. But I guess you should be able to manage. Again depends upon the crowd.

Depends on the on how crowded it is

I will check with my airline if I were you. Don't leave it to chance. And it all depends on how busy is the airport at the time of your landing.

Don't worry about domestic flights in US. If it is United Airlines they will accommodate you in next flight. Immigration usually takes an hour so 1:40 is good time you have unless your flight is delayed. Thanks

That all truly depends on how busy the airport is that day,move fast and with purpose and you should be fine