After replacing the passenger side lifters, the car has been in a low power mode or in limp mode?

I had the lifters replaced on the passenger side back in April. That solved my ticking sound but since then, the car has been in a low power mode or in limp mode. I can still drive it normally, even get up to 90MPH, but it just doesn’t have the power that it used to. Like going up a hill is a struggle and then I will have to use the slap shifter to get it up to speed. It doesn’t really give off bad engine noises but when it’s shifting, I do sometimes hear a single loud clicking sound. After the lifters were replaced, they did find metal dust in the oil filter but since that one time, which hasn’t been an issue at all and that was in April. It throws a code for cam sensors and there were misfires the dealership found on their computer. The dealership did find a connector that has the ground wire broken off and they replaced it, but the issue has persisted. I don’t have any fuel mileage decreases either. I’ve been to three local shops prior to going to the dealership and they’ve told me three different things without even opening the engine.

1. I just need to get a new engine.
2. I need new heads.
3. In need to have the camshafts replaced along with timing components.

Then some of these local shops contradict what the other shops have said.