czarmatra

I have rebuilt the motor, it is now 40 over, the heads are 193efi,i found the cam was to big for the computer so i changed it to the factory, all new parts. it will not start with the MAP hooked up, (tried 3 diff) it runs the best with the timing unhooked and the vacume off the map. New computers and sensors, good oil pressure, good fuel pressure, everything i change to new dose not make a bit of differance. i hook it up like it is suppost to be while runningand it dies, i have no idea what to do now, this was the inital problem with the big cam in it, i have or it should hace reset in the ECM with the battary unhooked, but still not truck, and thoughts before i cange this over to a carborated truck[][][]