ok as for the hesitation it can be a few things such as a sticking fuel injector, vacuum leak, bad spark plug, shorting spark plug wire. but since it did throw a code for intake air sensor that is most likely one of ur problems, what causes the hesitation is the sensor is not reading air being sucked into ur car and it is overcompensating for this causing your hesitation on acceloration, as for the misfire in the cylinder, did the code say which piston (cylinder) the misfire was in? im pretty sure when it throws a code for a misfire it tells what cylinder the misfire is in which will greatly help in determining where the misfire is. hey man u can look for me on aol instant messanger if u want ill be on for awhile tonight (virtualpimp85)