Originally Posted by
Martinjmpr
That's a tough call but I'd vote for "stop throwing good money after bad." Pay off the loan and see if you can sell what's left for parts. From its history it seems that this thing is only going to cost you more money the longer you keep it.
In the past when I've had to finance an older vehicle, I've always tried to pay them off as quickly as possible, especially if they were older, so I would never find myself in the situation you're in: Owing money on a vehicle that needs costly repairs.
And next time you buy a vehicle - see if you can pay cash and have no payment.