A: The answer to your question is that you should contact an experienced class action attorney. An attorney will consult with you for free, gather all the relevant available information, conduct an independent investigation, and let you know whether or not they see an actionable claim.
A: The answer, as with most questions asked of lawyers online, is: "it depends" and "message boards are no substitute for legal advice." Here, there just aren't enough facts to provide a complete legal analysis. However, if your check was the standard $1,400 stimulus distribution then, yes-it is likely that you were overcharged under California law.
If you wish to pursue your legal rights, you should contact a California attorney experienced in consumer banking law as soon as possible. I have assisted many consumers who have been overcharged by corporations and banks. Please feel free to reach out to my law firm.
A: With cracks in the frame it sounds like--regardless of the fuel injectors or transmission--the car is unsafe to drive. You should find competent mechanics and follow their advice. Under the facts as represented your vehicle must have been out of service for prolonged periods and, if under warranty, the manufacturer should have offered a buyback. If it hasn't, you should contact a competent consumer attorney as soon as possible.
Money should not prevent access to justice. The state legislature understood that the average consumer cannot afford to hire their own attorney and enacted consumer protection laws that provide fee shifting. This means that if you win your case, the dealer or manufacturer defendant must pay your attorneys' fees.