2003 Kia Sorento: Conditions for Problem: -Tranny in highest drive gear -RPMs 2000 or lower & coasting -begin acceleration Under the above conditions, the tranny seems like it can not stay engaged when you resume acceleration. Once rpm's get above 2000, everything is fine. This doesn't happen consistently.

Take extra caution while performing dirve cycles on public roadways. Drive cycles can be difficult to follow under normal driving conditions. Begin by: - Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on. - Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. - Hold at a steady speed of 55 mph for three minutes. - Decelerate (coast down) to 20 mph without braking or depressing the clutch. - Accelerate back to 55 to 60 mph at ¾ throttle. - Hold at a steady speed of 55 to 60 mph for five minutes. - Decelerate (coast down) to a stop without braking. If all other emissions systems are functioning properly, completing the drive cycle above will set the "readiness flags" required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog test.

you should use the highest gear possible to allow over drive to kick in, other gears will slow and limit the speed you can drive ,and stress the tranny

I would change tranny filter and fluid first . Run it. If okay you have fixed it. If problem still exists have diagnosis done it may be the speed sensor dirty or needs replaced.

Engine revs on its own, like? it revs up & down, up & down, if so, it is your Idle Air Control Valve (IAC Valve)

Choose 2nd that way the car will not coast to fast and it will also slow it down when your stopping but if its ice throw it into reverse so it will help stop

if this is a standard it"s time for a clutch and preasure plate.

Change the crankshaft sensor.

you might need a computer.

most likely tune up time. spark plugs usually act up around 60k

The trannys on the vw's are weird, they actually have a brain which tells the tranny what to do, when to switch gears under the driving conditions etc. Is thair a check engine light on? when is the last time you had a tranny service done on it? Also, it sounds even weirder, but is your alternator ok, is it putting out the proper volts to the battery? the alternator not charging the system can lead to alot of weird acting issues.