ok so im about to hit 150k and i wanna sell her with in the next year once i find the z i want, so what should i change out/ replace now.
I hae already done spark plugs and wires and cleaned injectors

 

i want a quiet machine and i want my gas milage back
!!!!

 

What kind of noise? That might help to be able to tell you what to fix. Gas mileage is affected by basic tune up stuff, (plugs, wires, etc..) as well as O2 sensor, fuel system (filter, injectors, etc). Air filter also affects mileage- there's a lot of things like that. Basic maintenance stuff for starters.

 

its the same sound that everybody says is the valve/lifter tapping and im trying to get her to selling condition cause m trying to get as much money as possible for it to get my Z