Help! Mazda 323 loses power and cuts out
 

I have a Mazda 323 Astina (BJ) 2000 model. It randomly loses power and cuts out. This happens when the car gets hot, e.g. sitting at traffic lights (them I am stuck in the middle of the road):mad:, a long road trip on the motorway (this is so dangerous and scary) :eek: It will not start up again for around 20min to half hour. The car will be running well no signs of any problems, then gives a little cough and everything has shut down. I have sprayed the MAF sensor with sensor spray, checked hoses for any breaks (couldn't see anything) I have rang a Mazda dealer they informed me this may be hard to detect, trial and error. I don't have the finances for trial and elimination can anyone HELP! with some advise, I am sure this may have happened to someone else, How was it fixed ? Much appreciated any advise. Woo