Should i sell my car?

I was wondering should I proceed about selling my car? Its a 1996 Chevy Lumina with the 3.1L V6. It has a little over 260,000 miles on it and it runs ok. No more major problems for now. I have owned the car only for a few months and in this time my husband has had to replace fuel pump, 3 tires, and a series of odds and in parts. Just the number scares us. He knows cars and has an interest in them, but doesn't have the time for alot of stuff. The car has alot of minor problems, but any of which can become serious. But I don't want us to waste money in alot of stuff to get it in great mechanical shape and it just crap out on us because of a blown head gasket or something almost unpreventable. Also we would love to put in a new stereo and speakers because they all don't work, but again don't want to waste money even if the stereo can be removed. Also cosmetically its pretty bad but not horrible. Also alot of quarter size dents and dings on the outside and miss matched panels and paint. Should we invest in this car? My husband doesn't have the time to compression test it and we don't have the immediate funds to get those tests done now. Any suggestions would be helpful. We don't want a car payment . Thanks.