D-jet idle - one issue thats not been solved, low idle on start up for a few minutes hot or cold...... Options

[DRPHIL914]

here is my set up, - its a '75 2.0 d-jet with very fresh and new in past 2 years everything,
,tested proper functioning AAr, CHT is the new 914rubberone, but same issue with my NOS one, no vac leaks , rebuilt throttle body MPS(ive tested 2 others one rebuilt by Jeff B same issue), etc etc , 123 distributor, anywayhere is what i have going on-

i think i am around 1000 for a good steady idle, if its lower than that warmed up, then i cant get it to idle decent when cold for the first 2-3 minutes, even with AAr open, same with a hot start after running for a while, then shut off and turned back on after sitting foor a few minutes, heat sink on the CHT maybe, i have a feeling the resistance of the CHT is not correct, it is a NOS correct CHT but i am thinking about adding that resistor to the cht line- any thoughts? i have to feather or hold the pedal down just a bit for a minute or 2 then it comes up.

like i said perfect idle around 950-1000 once on for a while or even stopped at light after running for a long time idle is perfect EXCEPT after turned off for a bit then back on--

Phil

[wonkipop]

down here, climate maybe like texas, i'm using Penrite HPR 30 (20W-60, full zinc).
think its an aus company.

a recommended mineral oil to replace SAE 30 or 20W-50 grades we used to have.

limited sources for mineral oil these days down here.

i've just gone through the whole cold start side of my 1.8 after dramas a month ago.
confirmed everything seemed to be working properly.
its the same as usual on a cold start now, way its always been. has to idle for 2 or 3 minutes warming up before it steadies at 950 or so. then its fit to drive. before that its hopeless. motor almost dies when it comes down off some applied revs. its bone stock.