Many problems

Hi,

i bought a 2003 Xplorer xlt with 40k miles on it and since a got it i'm noticing o few things going wrong with it. I shipped it to africa where I live and taking it to a ford dealer will turn out to be way to expensive. My major problem occurs when I slow down and try to pick up speed again by stepping on the gas pedal. When I do so, the car surges and acts like a "low rider", idle goes up and down and seems like i'm running out of gas and that it's going to shut off. This happens also when I slow down and make a turn. I was suspecting the MAF sensor or the O2 sensor. If so is it possible to clean them before replacement? Or maybe is it the fuel pump? What do you think? By the way, my service engine light is on.

My 2nd problem is electrical, when I put the car on "P", and I turn on the fog lamps, idle drops and car stalls. It happens even when driving, when I turn high beam on or fog lamps on, my driver side low beam gets very weak and my left turn signal on dash board lightens up (not flashing, it lights up green). I changed my factory light bulbs when I got the car and replaced them with HID looking like bulbs that produce a white light like xenon (it has nothing to do with xenon, the bulb has a blue coating on it that filters the colors and makes it white, changed them back but same problems occurs) do you think having the light getting weak or the car stalling when I turn on fog lamp on Park can and up being a huge costly repair? Or can it simply be a weak battery, altenator, a bad light switch. Or maybe something else? Please tell me all you know about these matters so I can check them one by one until I find the problem. Last thing, I live in a country where gasoline is very bad quality we run on non leaded fuel and it's very dusty here. Do you recommend a fuel line cleaner or injector cleaner?

thanks for your answers, i'll try to make it shorter next time lol!