I bought a 99 mercury couger with 130000 miles on it ..it ran good for 3 days and has'nt worked since what no

HAHHAHAHAHAHAH Sucker. Shoot yourself. You are stupid.

What is wrong with it? Who owned it? Did they drive it to the ground? Sounds to me they did a quick fix to sell it.
Hopefully you can get it going again.

battery? does it crank? do the lights go on? what does it do?

Given the lack of any details whatsoever, you really do not have a clue how many possible that question can have, do you? l have had cars with a lot more milage than your Cougar that ran just fine - there is a good possibility that it has a very minor concern. Out of gas? Battery down? Inertia switch tripped? Fuel Pump or associated circuitry? And literally dozens of other concerns... l wish you the best, and do not give up on it just because it has over a 100K on it.

Well what did u expect, l mean u bought a ford, what can l say??

Fob it off on some mark or try to trade it in on a Toyota?

You ''bought somebody is troubles.'' I've owned a couple of lemons, too. l hope you did not pay much for the heap.

Did you buy the car from a dealer or a private party?

If you bought from a private party, it was an ''as -is'' sale.

If you bought from a dealer, was there a warranty?

If so, contact the dealer for warranty repairs.

If it was an ''as-is'' sale, either from a dealer or private party, you are going to have to pay for any needed repairs.