Hmm, I'm not sure, but I think that if either sensor were the problem you would have a "check engine" light on. IF it is intermittent, it would still store a code. Most parts houses nowadays will retrieve computer codes for you for free-unless you have means to do it yourself. That's where I'd start...

Also, KIA has an onine shop manual. Not the best in the world, but it's free. Online Manual

good luck,

ks

'99 Sportage 4dr EX 5-speed, unmolested
'98 Sportage 4dr Auto 2wd
'96 Sportage 4dr Auto,235-75x29"tires, custom fabbed hidden receiver hitch and big plans.