Ford Windstar 1999 goes out underway

Hello friends, I have a problem with a 1999 Ford Windstar, it turns out that a few days ago it began to go out when I go, normally it does when I stop tread The coil or transformer and it is not seen to make false contact and even sometimes the idle begins to lower and climb from 600 to 450 rpm in drive and in parking from 1000 to 600, I tried the idle valve disassembling it and the enough one works because it contracts and returns to its normal position, not and found empty leaks because and reviewed the empty pipes Well, the clearing and diaphragm opens and closes and by connecting the void is regulated by accelerating, lastly suspected of the EGR or caudlimetro valve sensor because check the value with a multimeter according to a video on YouTube that shows you how to do it and notice that it has a varinte Flower or EGR sensor because I know that if this fault does not suddenly turn off the engine running but it affects consumption and sometimes the stability of the idle, please I need your support to receive an orientation and comments thanks and greetings.

You have two options if it turns off because the Relay goes down a lot is by regulation of the same or failure of some cylinder, if you are paid then you could have probemas with the coil or with the boot sheet. As to eat

Ok thanks, we tried pistons of the truck and they do not fail, injectors were tested and they work well, but I just discovered that the ECU control unit was dismantled and even lacked screws in the fastening for which I feel that it was already repaired, I am waiting for a good scan to know if it reports any fault code, because the Chek's aphyk does not turn on ... Thank you for your support.