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Have you checked the fluid level?Was there any oil leak spots under the car?
Correct any low fluid level and give it a try.
If the fluid is at the correct level,disconnect the battery for 10 mins then reconnect and try it again,if it still won't work you may have to have a transmission expert take a look at it.
You can put in a used transmission if needed and not spend lots of $$$ for a rebuilt trans,or just buy another complete vehicle to drive and not fix your 2002.
I had the same problem with mine about two years ago. The problem drove me nuts for six months. The solution was replacing the purge valve on the intake of the engine. With the purge Valve hung open when refueling raw gas vaper is washed into the engine causing the engine to become flooded after fueling. Hope this helps and good luck.
had similar problem, 2003 rio 1.6l idle fine and die when trying to accelerate or lurch and die ran fine in reverse change timing belt,wires plugs, had codes for multi cyl misfire and low injector voltage, still same lurch and die. try wiggle test on sensor plugs and main engine harness between battery and engine . i did this and found car smoothed out,tried wiggle again and car died,took harness apart where i wiggled it and found broken wire to crank sensor.good now
On 2003 Kia Rio the knock sensor is located under the intake manifold and must be changed from underneath the car. If you remove the oil filter it is directly above it and is in clear view once the oil filter is out of the way. The connector plugs in behind the intake manifold air breather on the top side. If you remove the air breather cover it will help you get to it. I wish I had someone tell me where it was instead of looking for it for over 2 hours. It is simple after you find it.
your post is 1 year old. i started helping others 1 week ago. as a fellow rio owner im here to help there are currentl over 5000 un answered posts. if you still need help re-post your problems .its free to get your check engine light checked at most auto parts stores . write down the codes and meanings. 03 kia rio's are blue booked at about $500.
if you re-post with a code you can get faster help. if your car dont have a code . its hunt and guess . my guess would be throtle position sensor,knock sensor or mass air flow