[JivenJim]

Pete at RS Barn is sharp. I have one of his Balance shaft delete kits. He's also been a good friend when I was looking for some spare parts. Nice guy... I first had the stock 3Bar FPR in there. Then I tried putting in my Variable FPR. It's running only 3 lbs. above stock. Say 51PSI. No difference.
Racer X 968 chip. To me that all sounds like fine tuning stuff. I'll check the plugs but the exhaust smells like a good mix. Since I didn't increase the 3.0 displacement I'm sure I'm not over running the stock injectors over duty. We're also talking low idle issues so that's even less squirts.

02 sensor should be good. If I disconnect it should go full rich just like in warm up mode right??

Yes I should get that exhaust done first. I just don't have time to take off work to get it done till next week.

Here’s the question. What changes in the engine operation after cold start about 2 minutes in?
Still to early for the Thermostat to open. I also bleed the coolant screw.

So what's changing making the smooth idle starting to hop.
If it was the Idle control valve wouldn't it bounce from the go. Same with any vac leak or low vac right.???

appreciate your brain power guys. All ideas welcome.