Corsa engine light Help

[DazSH]

Hi just had the error codes read from my corsa b sxi

I Had 4

P0120 Throttle position sensor 1 ( i expected this one as wire is unplugged as other faults cause it to bounce revs when left plugged in)
P1405 Exhaust Gas Recirculation feedback Circuit (Invalid Signal - Blocked this off and still reading the same so ignore)
P0505 Idle Speed Control Sys (Above max threshold - Tried cleaning still same)
P0505 Idle Speed Control Sys (Below Min threshold)

Any ideas

[DazSH]

Forgot to add car pulls back and with throttle sensor connected revs bounce and wont go past 1.5k any help appreciated?