OK so after i drive the car for about 30 min it begins to stumble. Any time i give it more then 25% throttle it stumbles and almost stalls out. I have cheaked the fuel pressure and it reamins at a 42psi and dosent fall of when i hit the throttle. I used freescan to cheak the MAP MAF and TPS readings and they all respond as they should. I am thinking the ICM may be getting heat soaked and failing. Has any one had any thing like this.

 

Yes.... heat soak of the ICM is a common problem. That's why Shoebox has a "how to" for spacing it out from the head to minimize the heat soak:

http://shbox.com/1/4th_gen_tech2.html#ICM_cooling

The optical sensor module in the Opti can also cause problems when it heat soaks.

 

When my ICM went out, it used to just kill the engine, not make it stumble. It's still a likely culprit though.

 

I still think it may be the icm,however i did the spacer mod almost 2 years ago. Ill test it tommarow

 

What was the fix?