I've been having a consistent idling issue for a week or so now which I had originally attributed to a torn lower intake boot. After replacing both lower and upper boots, there was no change in the cars ability to hold a steady idle.
The car seems to let the rpms drop to around 500 and you can feel the car start to stumble and shake if you are sitting at a stoplight.
My mechanic said he noticed the tear in the boot, but also noticed my CCV was on its way out. Is it possible that the CCV is also contributing to this idle problem?
While replacing the lower boot, I pulled the ICV and cleaned it with MAF cleaner. Does the ICV really only assist on cold start ups to adjust idle until the car warms up enough to idle unassisted? Could the ICV be the culprit of this erratic idle?
While the revs seem to dip down to 500 or so, the car will then compensate and rev up to almost 1500, smooth back down to around 7/800, then dip to 500, and repeat this process. The car almost feels like it is going to stall, but then catches itself.
I have not noticed any driving issues once the car gets going except that the pedal seems very twitchy in that if I lift off throttle to coast, the car will buck slightly as if I completely got off throttle after going WOT.
The CEL is on, and I had the codes pulled at Advance and they seemed to point to lean conditions which would make sense if I was sucking in unregistered air into the A/F mix.
Any thoughts would be great before I throw more parts at the car.
TIA!