yes, check the vacuum lines. you're gtp right? if so you will have vacuum Ts along the left (passenger) side of your engine that tend to break. trace it from that point on and find all vac lines to and from the tb and everywhere else you see them.
CPS sensor is not one you want to replace unless you know it's broken as it is a PIA to replace. it involves taking off the crank at the bottom i believe. not fun.
check all vac lines you can see. then come back and tell us what you find.