lack of power

Yes, they could be. Also worn engine, clogged cat. converter, dirty fuel filter, incorrect / worn spark plugs, dirty or bad air flow sensor, weak fuel pump and many other things. Are you going to replace all these, or take it to a repair shop and get it diagnosed correctly and replaced only the necessary part(s)? Zee

could be alot of things other than tps or throttle body.run a code check.