Hey there Ranger nuts... I came across this site and just had to ask. I have a 99 XLT reg cab, well taken care of I guess, no mods on it as of yet. In the morning I drive about 35 miles to work, and when I return home while driving super slow or even at idle, I get this LOUD humming from under the hood. My brother tells me its something sticking, restricting airflow, cause every now and then it will die. Sorry this is long, just maybe someone else has had this problem. Thank you for your time.