Idle just started hunting ?

[ace-rx7]

Right, drove the car to work and back yesterday 100miles, no probs at all stopped off on way back for 20 mins. When starting up agian Idle just bounces from 900-1500 ? well had to get home so carried on, car was missing,back firing.
it was boosting fine when passing miss fire. So thought f*&% it if it on way out then lets get it to blow and go from there!!! so gunned it home ! well it didnt go pop.
 
so what should i be checking and in what order ?
 
ps it was raining loads so could it just be that something got damp or am i just being a bit optomistic as it is still doing today ?

[Hayward North]

check the map sensor hose 1st

[ace-rx7]

yeah i did unplug that while it was running and car cut out, plugged back in and turned the key and it started but idle still bounces ?
 
i have just been outside again and idle settled down untill i blipped the throttle and then started bouncing.

[rx7veilside]

vac leak somewhere

[Hayward North]

Guess it could also tps and throttle idle need adjusting, also lambda.
As well as a hundred other things, just start looking.

Vac leak duz sound highly likely though given thair history of developing em.

[Jono FD3]

Could also be the idle valve thingy under the plenum!! When mine was being mapped it did this all of a sudden........ map man jumped out tweeked a screw under the plenum somewhere & all was good!!!

Jono