Help my family fix our only vehicle

Hello everyone I have never done anything like this before but unfortunately I don't know where else to turn I am completely lost on what else to do last year we got a family car a 2005 chrysler pacifica from facebook market place I know  worst place to look for a car  I know that now unfortunately we only had so much for a car and needed 1 desperately, everything seemed ok until march of this year the car started making this weird noise then when I drive my whole dash board starts flickering and the speakers start making a crackling noise the radio cuts in and out and my head lights start flickering now my car will turn off while I'm at a red light. My husband was laid off due to covid we applied for unemployment and still have yet to recieve anything we constantly get the run around my husband is back to work but only part time. I stay at home with the kids 2 of our children whom we adopted are special  needs.
This is our only vehicle we have 3 children plus my niece this is how my husband gets to and from work this is how I'm able to take my children to all their dr appointments to grocery store everything I have taken the car to get looked at no codes come up at all and none of the mechanics seem to know whats going on they keep saying it might be this or this  buts going to cost this Im afraid my car is going to catch fire while I'm driving with my children we don't have the money to keep paying for different machanics to try and guess what the problem we need help desperately
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