Hello, this is my first post and sadly, it's a problem. A few months ago I bought a fully loaded LS w/ the 3.8. It has developed a miss and hesitation mainly at high rpm. I have changed the coil packs, plugs, wires, fuel filter, air filter, and egr valve. It's been hooked up to a computer Several times and nothing, it's still fighting me and HATES hills. I'm open to any suggestions. Thanks!

 

Check your fuel pressure.

 

Never thought of that. Will do first thing in the morning!

 

She's throwin code # 404. Has anyone had to deal with this? I'm not the greatest with electrical problems.