Rough Idle/Stumble after LIM Install

[hesersypb]

I replaced the LIM and now the car Barely runs. While Idling it sounds like it has a huge vaccuum leak but I can't find it. I common mistakes or an easy way to create a fog machine?

 

[Liquifire]

get a can of carb cleaner and spray it in all of the areas of the vacuum lines around the motor.........when the idle picks up rpm's you found it........do you have a way to scan the vacuum? If so, what are you at now? EGR fully functional?

 

[TheOtherNick]

Did you put the ground back on behind the coil pack bracket and is it grounded good? That will cause a lot of problems.

 

[hesersypb]

Ground is connected will try the throttle cleaner tomorrow

 

[TheOtherNick]

Make sure it is grounded good tho. Mine was hooked up, but not grounded good and my car ran horrible.

 

[tylerbinski]

did you use a sealant paste in the four corners when installing the LIM gaskets?

 

[hesersypb]

I did use the sealant paste.

 

[BillBoost37]

Troubleshooting, I love this part.

There's a couple places you can get a large vacuum leak from. First is on the back of your UIM the brake booster hose connects as does the HVAC vacuum connector. The brake booster is big.
Second place is the EGR tube, I've had a bunch of these crack on me when not being overly careful and removing it entirely from the engine before pulling the LIM. In the past I'd unbolt at the LIM and pull it back. After 3 or so cracking at the edge where the bracket holds it to the LIM, I learned a lesson. This is large leak number two.

Beyond that the TB gasket or maybe the IAC isn't connectoed fully.