If there is a "_______.car" or "_______.spec" in your folder, you must remove it. This will cause the game to glitch and often only show a car with no parts. No one will bid on it, and it is easy to get for $125 but you must remove this file before playing the game.
Fix parts
To fix any and all repairable parts while they are still on the car without having to take them off, press [Delete] + [End] + [Page Down].
Free job
When you are in job mode, press [Insert] + [Home] + [Page Up]. The job will automatically finish, you get to keep your money, will get paid.
Free parts
Take parts off people's cars then enable the "Free job" code. You will still have the parts under that car name and still get paid the full amount.
God-like mode
Do all the jobs you can. After it says that there are no more jobs, get a cheap car from the auction, fix it up, and try to get more than $20,000, which will get you to God-like mode.
More money
When doing jobsstrip the car of all its parts and then go to the action and buy the car you just got all the parts for and scrap all the parts you got with the car when you bought it and use the parts and you will be + money when you are all done after striping the car use the free job cheat.
Bad file...