If you dont get any codes, it makes it harder to find out what the problem is.

This car hesitate/hiccups on acceleration load at mostly between 40 and 65 miles per hour. Sometimes minor hiccups at lower acceleration speed. I have had the vehicle into a repair shop several times and it has not been fixed. This last time in the repair shop they diagnosed the problem as being in need of a "mass air flow regulator". The part cost approximately $120 and the installation was $89. The car now runs the same or even worse than before.