LTs put your 02 sensors farther out. Do you have a wideband? Our cars are 25 years old, so one of those 02 sensors could be bad. I'd also check for a wire or vacuum line that got bumped off during the install.

 

my car doesn't have o2's they've all been tapped, im checking for vaccuum leaks now. Thanks for a reply 👍

 

I had a 5.0 that surged, the egr valve was bad.