I bought a 91 chevy and was told that it would pass inspection,but it wont.do i have any rights about getting my money back.

This will depend on your sales paperwork, your warranty and your local laws. Find someone up to snuff on these issues here: http://www.naca.net

I bought a used boat from a guy on craigslist last week, 2 days later the motor broke down. can i take him to court?

This will depend on your paperwork for the sale, the warranty you received and your state's law. Find someone up to snuff on these issues...

This will depend on your sales paperwork, the warranty you received and your local laws. Find someone up to snuff on these issues...

I bought a used car from a dealer ship three days later it had problems

This will depend on your sales paperwork, your warranty and your state law. Find someone up to snuff on these issues here: http://www.naca.net

Purchase a mattress 3 months a go and got an ingury with a coil from the inside of the mattress, don't have my receipt

Unless you paid cash, you have a canceled check or a credit card statement which will prove purchase.

Can I have a mechanic put my car back to it's initial state if I don't think they're being reasonable in their pricing or work?

I would not. I would take the running car to a qualified mechanic and then demand a refund from this huckster. If you receive no refund, complain...

Can I have a car dealer pay for repairs if I believe that a vehicle I purchased was wrongfully advertised?

If this is WHY you bought it, then you may have an argument although, you should have tested it within 2 months. If this is NOT why you bought it,...

Can I legally sell a car "as is" without telling buyer of potential problems?

The issue is whether or not this is a "material" fact. If so, hiding it is not OK. If not, it's no biggie. I'd recommend to any serious potential...

Purchase of a used car from a dealership who has not been successful in making the repairs.

This will depend on the contract, the warranty and the NY lemon laws. Find someone qualified to weigh in on these issues...

What are our options now?

There are a LOT of possibilities here, including simply, to return the vehicle and get money back. It's one you should strongly consider if you are...