2005 corolla throttle plate tps sensor

#1
my 05 has 305,000 and idles ruff most of the time (around 650 rpm). When I hook up my scan tool I notice the reading on my TPS shows about 15.7% to 18% key on engine off. Wide open throttle only shows 80%. To me it seems bad but loading the parts cannon and shooting a $300 part is a tough pill to swallow. This idle issue has been going on since about at 225,000 miles. Cats are gutted, O2 simulator installed, new timing chain set at 300,000, new VVTI sprocket, oil solenoid, new injectors and plugs.
Anyone have an 05 they can plug in a scan tool and make sure the tps show 0% and 100% at wide open throttle.
 
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