[Mk2] [NA] starting problem -related to rough idle?

[monstr2]

I've got a starting problem in my car which is a rev3,na and have
been unable to solve it.
It takes 5-6 cranks to start everytime and when it does so it overfuells. The idle is not stable i.e. it fluctuates a couple of millimetres upwards towards the 1000 rpm mark.
Alongwith this fluctuation the engine vibrates a bit.
I've changed the o2 snsr,fuel pump,cts,fuel filter,intake plenum gaskets,cheked injectors ,fpr,map snsr,ignition and cam timing and compression.
Can someone suggest what the problem could be?

[dingleburg]

it could be the cold start timer switch (not sure if rev 3's even have them though) mine failed on my rev 1 and gave the symptoms you have described, felt like it was going to cut out any minute (and often did) pricey new from toyota though!

[monstr2]

The rev 3 doesnt have cst.

[toxo]

Idle control valve bunged up? It's on the underside of the throttlebody and takes an air feed from the intake pipe, between the air filter and the throttlebody.

[monstr2]

I think i'll open the iacv rather than just spray the tb with cleaner. The idle actually oscillates ,to use the correct term.