I have a 2001 sportage. Most of the time it runs fine; smooth acceleration, good power but on other times it acts like someting is shuting off. There is suddenly no power at all; it cuts out, than a couple of seconds later it kicks back on than off again. Sometimes it is so bad that i cannot move at all. If i let it cool down for awhile, it will work well for awhile than act up again. I changed the fuel pump, cleaned out the fuel tank replaced the fuel relay, and it worked well for several hours, about 500 miles on the highway, than quit again