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Hi. I have a 2001 xls. Whenever I accelerate going up an incline there is a very obvious droning /humming sound that comes from under the hood area. It pretty much only does it when accelerating up a hill. I just had the IAC replaced with no difference. Any ideas? Thanks, Pauly.

Hi there. I was wondering if the A/C compressor can be responsible for a slight hesitation feeling while driving. Occasionally my explorer has a very slight hesitation. Two mechanics mentioned the a/c compressor going through cycles can cause this since the rpm's slightly drop when it kicks...

CDomb. You once posted a thread about a whining under the hood that sounded like a dentist's drill. I have the exact same problem in the exact same conditions. Could you please post a response if you figured it out. I would be much appreciative. Thanks, Pauly.

Hi there. I have a 2001 xls. On occasion (every other day) there is a slight hesitation feeling when I am driving. It is as though the truck does a very mild jerk. It has happened at 30mph and on highway speeds as well. The dealer recommended a fuel flush and filter change and a spark...