Idle response to clutch

[kossdust]

Ok, I have been chasing a high idle problem for the better part of 2 months. Kept testing things and finding them bad so I have replaced a few things along with a few small vacuum leeks. The list is as follows

EGR Solenoid
EGR DFPE
Vapor Solenoid
TPS Sensor
TPS connector

Cleaned Throttle body and IAC vavle.

Now everything seems to working much better then it has been but my question is

What should the idle do when I press the clutch in?

My idle will slowly drop to around 2000 rpms, and will stay steady there until I come to a complete stop then it will idle down to 800-900. I am thinking it should drop down to 1000ish immediately upon pressing the clutch in but can not be sure.

I am thinking two things here, the computer just needs to relearn a little bit with the new sensors and stuff and/or maybe the EGR valve is a tad sluggish. The EGR valve test good but maybe is is not fully opening/closing like it should. I have a new one laying around so I am going to change it but for the life of me can not figure out how to get it off. I can get it off the throttle body but not the exhaust part, I have tried pbr and everything but the darn nut will just not budge, there is very little room to work on the backside

Also if an o2 sensor was a tad slow at responding I would get a check engine light correct

 

[LearjetMinako]

Usually when I push the clutch in at speed. Depending on speed the idle is around 1,000 to 1,500 rpm's. Lower speeds at around 50mph or slower seems to hold at 1,000 rpm's. Faster speeds at around 60~75mph, it holds about 1,500 rpm's.

 

[mentalbreakdown00]

An EGR valve sticking would cause it to stall on decel from the diloution of the a/f mixture. Sounds Like an IAC control problem, or an IAC problem. To a point will a slow responding O2 sensor not cause a CEL, it depends on year, make, model, calibration, and how slow it actually is to respond.

 

[kossdust]

Well I thought I had posted this in the 4 banger forum....

This is on a 1998 2.5L B2500
I have zero CEL codes. It seems today my idle is getting a tad better, idle seems to be falling a bit quicker. But still a tad slow to respond.

I feel idle should fall to around 1000ish in about 2-3 seconds. Mine seems to take 6+ seconds and sometimes will hover around 2k as it falls.