Easiest thing to do when you don't have a scanner is check the basics. You know the plugs and wires can't be bad because they got you there. The injectors must be good as well. The running poorly on the way there was a symptom of fuel/air/tune up issues. Let's rule tune up out since it got there.
Fuel and air ... Try unplugging the maf to default to table data instead of sensor data. If it run poorly when you do this, give it a little time running and it'll learn the parameters better. Drive home and order a maf.
