What is wrong with the car , when it turns off On the road and won't turn back on , when I try to start the car.

I'd start with the coil pick up in the distributor, Electrical problems are a bitch, hard to find. An engine needs three things to start first is air, I assume that's not the problem. Then fuel -check if gas is getting to the throttle body. If not then it is fuel system-filter pump, etc. Next and sounds more likely is spark. Check if you are getting any spark at plugs, then trace it back. You can start throwing electrical parts on , which could get expensive if you guess wrong a lot. You need to find a mechanic that is good with the electrical stuff.

I think the first thing you need to do is find a mechanic who know how to diagnose this car. It could be a lot of things. You need someone who can narrow a little before spending a fortune throwing parts at it an hoping for a miracle.

I think mb.byy keep on trying to start it u could of blown ure starter.check ure starter or its fuse it has two one in the enngine compartment to but them were good thing to change if ure car was doing that im sure the mechanic.checked the fuel pump but it might be just going if its the starter why its not turning over .check the fuel pump when i shuts down check iif u hear it.and if its not. That it sounds like someone put sugar in ure tank mb.esp if u changed all 3 of therm things.