Black smoke coming out of muffler and electrical signs not working?

black smoke is your head gasket - BIG money,

the electrical is probably your alternator and

the shaking yes, is a sign to retire it.

i don't know if you can get a naive enough person to buy it.

Black smoke is an indication of an engine running very rich. You should have a check engine light on. But anyway, check the normal things like a clogged air filter, or fuel filter. The O2 sensor can be bad, or a malfunctioning catalytic converter. Anything related to the fuel system is suspect right now. Anything that will fool the ECm to think that the engine is running lean and the ecm adds more fuel to the mix. Take the car to a reputable garage for testing and diagnosis. good luck

your pony seems to have a harness problem. I've worked on hyundai's with similar problems. the shaking is of course your chassis, I've seen some of them open up on the older hyundai's, this inturn cases your harness to become pinched due to excessive movement in the body resulting in the harness shorting and going haywire. It can all be fixed, but it would be expensive, if you have the time and money go for it.

Call the scrapper. The old Hyundai's were some of the worst cars ever made.

ooh no a Hyundai,I was told to never buy one

sell it..somebody will buy it for the right price..