i have a 2001 f150 4.6. it seems like when im at high speeds like around 65 and i have the cruise control set and i can hear my motor surging (kinda like a "wa-wo-wa-wo-wa-wo" sound)..

also my a/c seems to blow out the defrost vent and floor pannel at high speeds at certain rpms.. its still blowing cold air and when im just cruising around at low speeds it works fine..

fyi i checked my vacum lines under the hood and dash and everything seemed okay.. i pulled the line that goes into the dash and checked for leaks and holds pressure just fine..

if someone can please help me out figuring out whats going on id really appreciate it. if all else fails ill still push my ford than drive a chevy!!

and yes im new to this forum deal..