been having this problem for awhile... i replaced the MAF and that did no good still light comes on... also i replaced the burnoff relay.. still light on? should i change the MAF power relay? and also now notice it backfire threw the intake system or poping noise! anyone have any ideas

 

Probably because 34 is a MAP code, not a MAF code. It's for low voltage at the MAP sensor. make sure that you have good contact at the MAP but I would be looking for a bad EGR valve sticking open.