D-Jet issues, Hot start idle problem, and stumble @ 3k rpm Options

[DRPHIL914]

I have been fighting an issue for a while but it seemed to be intermittant.
- when car had been running and is good and warm but gets shut off. If i restart lets say in 5 minutes or so, say for gas or something, upon starting it the idle wants to drop out and die if i dont keep idle up with pedal- this lasts for about a minute or so, then it seems it will level off and idle normally.
- i had read about issues with the CHT - the one i have was new a about a year ago, - tested as correct at that time-
- this issue appears to be worse recently- did happen to a lesser degree when on the octeenerfest trip.
- i have also noticed that watching the AF meter, that over the past month or so it seems my start up and warm running ratio has been slowly changing- getting more lean, could that be from the CHT? would the CHT resistance slowly change over time?
MPS tests out o.k, and that usually defaults to rich right?
- so i had read about adding some resistance inline to the CHT( i did this a few years ago, so i have a couple rheostats in my bag- yesterday after driving hme i stopped at lowe's, came back out and startedthe car, idle was so upand down, wanting to kill, it was hard to keep running. - so i stopped it and put the variable resistor in line to the CHT, set @ 250 ohms,, the restarted the car and rather than die out or have to keep the idle up with accelerator pedal, it started smooth and ran just fine, - BTW if i tried to change the idle richness iwth the ECU idle knob it didnt matter -

Testing over the past 2 days i have seen this: the CHT when warm, upon stopping and restarting the car, seems to have the wrong value, getting warmer maybe while sitting- sending a bad signal to the ECU - adding the additional resistance has gotten rid of the bad restart idle when warm, AND now rather than running lean at hwy speeds- 2800rpm,@ 60-65(was getting up around 14-16, and in past had been @12.8-13.5 at most, now is running more around 12.5, and cold idle, start up about 10-11.

Conclusion: bad CHT ? or something else - it was beginning to happen sometimes even when warm and sitting in traffic, idle wouuld be fine and then all of a sudden being to drop and vary, even try to die. .

Now the stumble- Probably the TPS - but that board is new just a year ago, and less than 2500 miles using it. I will try to do a cleaning on it and see if that matters but should not be worn already! Got the board from dave sprinkle. r

with the additional resistance in line my warm ide is right around 950-1000rpm and a bit more rich than it was before but this seems much better. - car seems to now be running a bit cooler at highway speeds

i think i need to get and test ad different CHT and a new TPS board!!

any suggestions from other D-jet users would be great -