My kia sportage starts very well without any problem but can not move because it cuts off when accelerated.

SOURCE: My 98 kia sportage wont idle properly

its most likely the idle air control valve. the sportage have problems with them sticking its a little black box on the front of the intake tube held on by two screws if you take it off and flush it with carb cleaner and clean the connector as well your problem should stop

SOURCE: My Kia Sportage 1999 has no acceleration at 3000rpm

sounds like a catalytic converter

SOURCE: changed my timing on 2002 kia sportage and it still wont start wy

check for spark if present recheck timing, check if fuel is present at motor, if not check relay

SOURCE: Can't get my 1999 Kia Sportage to start

1999 kia sportages are aP>O>S. I know i have one. my suggestion is to burn it

SOURCE: 2001 Kia Sportage runs rough

Yes my frend open the bonnet and stand infront of the car, on the left hand side between the engine and the boddy there is a black round container with pipes going into it. next to the container there is a vacume switch, 99% of the time this pipes going into the switch is brohen or the pipe is leaking. Enjoy Willem SA