Help
 

I have a 2002 blazer all was good until went to drive in the snow.My four wheel drive would not kick in and having a bad loss of power.It gives me the maf code so I changed it and no change.Found out today that my vacuum actuator is busted does that have anything to do with my loss of power.They both happened at the same time is what has me puzzled.

Cat was stopped up.Go her going again.