Problem when I started my fox

[Campeto]

Hi, I am from venezuela, i don`t speak or write english perfect, but i do my best. My problem whit my mustang 1991 is when i turn on the engine it`s started very well, but later around the 6 minutes or 10, the engine started to donw rpm and turn off, when this happened i press gas many time to try keep control over the engine to avoid turn off, this process stay long 5 minutes more o less and later the engine stabilize fine, this fault happen every time when turn on, other point, is when i going running and the fault appear the car down the speed making explosions, but when i turn on the air/co the car go back to run normally but later reduce speed againts, turn off the air acc recover strength againts, on off on off the acc and later the engine stabilize fine. I dont Know what happening. I changed all sensor and nothing.

Thank for you time, sorry for my english

 

[2000xp8]

Here's a good page to start figuring it out.
http://www.stangnet.com/mustang-forums/698148-help-me-create-surging-idle-checklist.html

The codes may tell you what's wrong.

 

[S&B]

make sure your fuel pump and pressure is good, also make sure to put a new fuel filter in the car. its always good to check that your getting good fuel and Air. you said you cleaned your MAF (air meter) so you should be on the right track