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**Ashton Crusher** · August 16th 06, 07:13 AM posted to rec.autos.makers.ford.explorer

On 13 Aug 2006 03:51:22 -0700, wrote:

>Our 93 ford explorer has been a real champ in the last two years that
>we have owned it. It has been very well cared for with only 72,000
>miles... but lately we have noticed two things. When the car first
>starts cold (IE: First start of the day) the car runs fine, but when
>put in reverese, will die immediately, and run fine once restarted.
>Secondly, (and the biggest issue) is when sitting and idleing (doesnt
>matter if its cold or warm) the engine goes up and down from 500-600rpm
>which makes the idle pretty rough. Also, when starting from a dead stop
>to accelerate, you press the peddle and the car seems to "hesitate" for
>a few seconds before finally accelerating. Does anyone have any idea as
>to what may be the issue?

The vacuum leak suggestion is a good one. If that's not it I would
consider a bad throttle position sensor or a bad idle air bypass
valve. Both are inexpensive and easy to replace yourself.