hey guys i been reading a lot about the TPS sensor but i havnt found any one that has this problem exactly was wondering if some one can help

from a start
1st gear shifts fine
2nd gear fine
when it shifts into third it drops down in rpm about 1200 and then rises to 2000rpm and then back down to 1200ish it will do that about 1-2times then operate fine
it sounds like a TPS problem would that be a good start?