weird map code
 

i got a crx with a zc and a te04h set up with the safcII and 450's im only pushing about 4 pounds....my problem is after i start driving the car for a little bit when i let off the pedal and go into vacum i throw a map code. i dont think it is cause the map is reading boost because it only seems to happen when i let of the throtal.... i put in three check valves just to see if that was it and it still didnt fix the problem..... when it throws the code the map just goes usless and i have to turn of the car and turn it back on..... but i have my safc leaned out all way and it still seems to run rich cause when i pull a vacum line it will even out and run a little better cause right now it is running like ----