driving fine tried to accelerate car wouldn't go pass 30 sell or fix help!

What is your question?

I was.coming out.of.going 30 mph car driving good in town went to accelerate car wouldn't.move pass thirty even when foot was to the floor. I'm really considering.selling it. No mechanic have time to do house calls I'm wondering could it be the.massive air flow sensor. Please help asap.like.my car if I can.get easy fix I will.but.if it's expensive I'm ready to.sell have had no ride for about a.month.