10k mod problem

[svenny14]

Hey guys, love the website i have been a member for a couple weeks now but this is my first post. So i did the 10k mod a couple days ago and decided to try the 5.6, i didnt like the idle so i took it out this morning went to start up my truck and it would barely start. Then after getting it started my service engine soon light came on so i put the 10k back in and it started fine and the service engine light did not come on. I have no idea whats wrong and help would be greatly appreciated. thanks

[ABOBB]

If you did the DIY 10K, where you insert the resistor into the plug, you may not be getting a good connection between the plug and the sensor now.

When this happens.. it will throw a code, and the pcm will assume a certain pressure and use only that.