engine bogs down at about 1500 rpm

What is your question?

i just replaced the fuel pump, fuel filter and air filter on my 2004 chevy astro van. also i cleaned the Mass Air Flow Semsor on my van and im still having problems with it boggin down. i would rather not have to take it to the shop as i enjoy doign it myself and saving money at the same time. im kinda lost now though. i have no idea as to what to look at next. help