alright here is the story i just got my 347 stroker running a week ago and it's running real lean and setting the check engine light which is no big surprise with no egr or emsissons crap on the motor but it keeps setting code 157 maf voltage to low so i plugged my scan tool in and it was completely flat 0 voltage coming out so i figured the maf died so i order a brand new pro-m meter 80 mm and there filter plugged it no difference it's still dead so i checked the wiring all the way back to the pcm all the wires are good so i replaced the pcm no difference the maf is still dead so now i am lost anybody have a problem like this it's a 4 wire connector the first wire was 12 volts the second wire is the ground and the 3rd wire is maf rtn which i don't now if that wire should have voltage or if it's a return and the last wire just says maf on my wiring schmatic and has no voltage any help would be a huge help becuse i am lost now thanks in advance 
