1996 VS commodore, 2500rpm idle

[B3ND3R]

hi guys,
driving around last night, stopped the engine, started 5 mins later and idle was sitting at 2500rpm.

after driving 5-10 mins it settled down, but the after it was stopped and started it idled at 2500rpm

i disconnected the battery last night, restarted it cold this morning and was ok, drove round and got it hot. as soon as i stopped it, let it sit for 30 secs, then started, idle is back up to 2500 rpm.

the only thing done recenlt was a coolant flush, but i have tripple checkd and there is no air in the system.

i am a bit stumped, any input would be greatly appreciated, i am hoping it is just a bung MAF sensor or idle air valve...

please help!

 

[B3ND3R]

no one can help?
i wanna try a few things before work tomorrow... any ideas at all?

 

[greenacc]

check error codes. could be IAC, TPS, vacuum leak, or for some reason it is idling at the COLD temp startup setting.

 

[B3ND3R]

which pins are bridged in VS for error code readout?
is it likely to be anything do do with the coolant? or more likely that water got into a plug?

 

[Vee-ard]

Pin 5 and 6 like every other one

 

[st3r3otyp3]

Possibly a spark plug lead is getting hot and losing resistance, same as when a lead is not connected it will idle higher, so first check that there all connected properly, beyond that IAC is a most likey culperate.