1985 Corvette Prices

I sold a car to the best of my knowledge and 24 hours later the buyer claims major problems and wants to retur?
I sold a 1985 corvette priced 2000 below kbb fair trade in value i did this because interior cosmetics were far from perfect and it had a check engine light code for an air sensor or something like that and i needed it gone asap before my dad killed me for having so much stuff. It was sold to a 19 year old who desperately wanted the car and i sympathized with him sold it for cheaper and cheaper and even offered to cover fixes of up to $200 if he brought the parts to fix (understand i did this because i had no intention of ripping him off or anything of the nature) anyway he lets his friend who is relatively new at driving stick drive it home and the whole time they were test driving it he was constantly over revving the engine and just plain treating it like crap. a few things to note the battery was iffy towards the end of the 4 hours they were there so i offered to replace it with a spare i had in my storage unit a ways away the next day i felt i was being of good nature helping the guy out as much as possible they were pleased with the car so i helped clean it up to present to his parents yet another while they pay me a little in cash and the rest in check (banks were closed that day) apparently 30 miles down the road they have broken down on the side of the road the whole time all i could think was HOW IS THAT EVEN POSSIBLE i have driven the car everyday the week prior without a problem set aside the idle from that sensor they start saying "we need to return the car we need to return the car" so they say theyre coming back to my house i told them i would not take the car back because i cant that was my whole reason for selling so cheap in the first place. anyway they dont show instead they drive it home the next day i go to cash the check and they say they cant cash it ($3000 check i know im stupid i thought we were all in good faith) so i call the family and he puts me on the phone with there dad who says the engine blew up we talked to the cops they said i was in the wrong and that we should hold the check (summarized) naturally i think no way the car was fine i had no knowledge of any of this happening ever what do i do im at a loss... i need help asap should i file a small claims suit and get them to pay the check that im sure has bounced? FORGIVE SPELLING ON TITLE ITS LATE. oh and the father seemed rather hostile considering all i had done to insure the son was happy with the vehicle and comfortable im sorry just to clarify THE father called the cops and said that the cops said to cancel the check because i was in the wrong

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