1998 Honda Accord throttle position sensor

i recently researched the symtoms of a faulty tps. and that seems like the problems im having. hesitation, poor gas mileagle, weird idle.. the only thing is.. my check engine light never came on.. could this be the problem still?? i called honda and they said id have to buy the whole throttle body. i found a website that sells them separately. should i buy it separately and try to see if this works rather than buy the whole assembly??

here is the website that sells the tps.


http://www.iapdirect.com/product.php?productid=42003&cat=0&page=1&gclid=CKejp8nFxZQCFQWxsgodxyUGUQ


thanks so much.