Started engine after 75 mm throttle body and 5/16 spacer instal. I also enlarged the throttle body port to 76mm and smoothed and polished out upper and lower plenum. After running for ten minutes idle was still high about 1200 RPM. I did a ECU reset And it cleared the light but came back ten minutes later And idle still high. Does anyone know what I should do next. I haven't checked the engine code yet,

 

I would check for an air leak. Did you forget your gasket between the upper and the lower plenum?

 

Thank you for your response on that I did check for vacuum leaks as well. However, I did an idle
relearn Which solved the high idle issue. I also did a throttle body. Positioning relearn. Then I cleared my codes.The service engine light have not returned after a hundred miles. The upgrades have really helped the performance of the engine, mainly the mid and upper range. My 0-60 time went from 7.3sec. to 6.8 but the mid to higher range is where I can really feel the diffrence. Hopefully this will help others. I found the relearn procedures on YouTube.

 

Glad you figured it out.

 

Now you need a tune!

Here's a link to the relearns in case anyone else needs them: https://uprev.com/wp-content/uploads...-Functions.pdf