Alternator/generator/regulator problems of the 2006 Hyundai Santa Fe

This happens more often than none now. I can be pulling out into traffic of just crusing along when I press gas to go whenall of a sudden the car jerks, looses power! like its going to stop and stall in one quick second and throws me forward even with my seatbelt on it jerks me I only had it stall one time, so far. If I let off the gas and press it again it seems to help and power comes back, sometimes. I almost got hit pulling out into traffic because the car lost power and wasn't going anywhere when I had gas peddle pushed. When all this happens the engine light will come on and than go off, sometime now the engine light comes ons and stays on for a few days and the car has a lot less power or feels like its going to stall, than the light will go out on its own. I had it checked out and they told me I needed an alternator so I baught one when my son and my neighboor was going put it in they checked the alternaor and battery and they were fine and have been checked several times and are fine. Also at night when I press the break to stop or slow down the head lights will dim and I can feel the jerking of the care just a little bit. I am so afraid to drive this care sometimes or on the beltway because I am afraid its going to stall/shutdown or shut off that its going to get me killed and I am also afraid to drivge my grand children because of the same reasons. Please help me! I can't afford to keep getting it looked at when it doesn't happen all the time they can't find anything wrong with it. What can I do to fix this problem. When this happens I have no sterring or control of the car for that split second and I am an emt/firefighter I know that split second can kill me and anyone else in my car. I had baught the car used last year and it was doing it just a very little bit at first and I called the used dealer and he said its bad gas.

After engine is warm, about 20 minutes later, there is a gurgling in the fuel tank when the key is turned on (before and after the engine is started). I think it is fuel being returned from the engine. I have had it in two different Hyundai service shops, with the fuel pump replaced twice, and a fuel pressure regulator replaced. Having given up, both shops contacted the district Hyundai office and a field service adviser told the local shops to show the event as "normal". It is not normal and I think the Hyundai district office is hiding the problem. Could be a fuel system problem and could be a safety hazard if fuel starts leaking. Both local service departments now show the problem as "normal" and nothing more will be done on this problem. I believe a recall for this problem is appropriate.