4age hesitation + TPS issue?

[merc-blue]

Its a early bigport Tvis
On initial start up it runs good as gold.
But about after a minute when it gets off warm up the idle drops to 700 RPM (it used to idle at 1000rpm) and missfires and is generally fluffy then when you attempt to take off there just nothing no massive overfuling back fires just coughs and slowly builds revs over 2500 its clean and free.
once it warms up it is all alot less severe.
I have clean the throttle body and just given her a full service including new plugs and coolant.
any ideas?

I decided to check the TPS. and currently regardless of throttle position between E and Id im getting open circuit shouldnt it be closed when the throttle is closed?

[merc-blue]

I think i know whats wrong i ran it till it went crap unplug TPS. good as gold again i think it may be out of adjustment does this sound right?

[TERRA Operative]

Here's how to re calibrate the TPS.