Stumble off idle

[Jtrux]

My project is coming along but still has some issues.  One is that when idling or accelerating from a stop, as soon as you crack the throttle and manifold vacuum drops, it really stumbles.  Once the vacuum catches up a little, it seems to be okay. Taking off from a stop seems to exacerbate the issue.

 

Any thoughts?

 

 

[benjy_26]

My 2.5 was doing that til I installed new gaskets in my TBI unit, replaced my intake/exhaust manifold gasket, and plugged my egr. I basically took care of a bunch of leaks in my engine and it went away.

[Jtrux]

I think that my EGR is stuck open.

 

I do not have it hooked it.

 

Here's another reason I think it is stuck open. When I cover the throttle body up with a rag, there is no change at all. It must be drawing air through the EGR.

[benjy_26]

Yep. Sounds like you have an intake leak somewhere.

[spyder152]

Mine is doing the same thing, but only when it's cold and the idle is below 1000, once it's warm, runs great, i'll check for leaks

[cruiser54]

My project is coming along but still has some issues.  One is that when idling or accelerating from a stop, as soon as you crack the throttle and manifold vacuum drops, it really stumbles.  Once the vacuum catches up a little, it seems to be okay. Taking off from a stop seems to exacerbate the issue.

 

Any thoughts?

What year and engine?