Non adjustable rockers

Can someone write out simply instructions for installing them, and if there's any tolerances that need to be checked. I'm simply asking this bc I have a valve train issue and valves not opening/closing properly. There is gas in the intake making me this its an intake valve issue. I just want some insight as to what I need to do/look for.

Compression is fine which has me scratching my head

I loose power as I'm cruising, going up hills I need to downshift or ill be going backwards, and when I hear the engine in the morning its noisy and feels rough, the car sometimes hesitates for a sec and revs up or it majorly hesitates and it needs like 50%+ pedal to pick up any speed. Lastly when letting off gas the rpms almost always jump a lil(positive its not trans)


Most notable to me is at idle as it will stay smooth at 750 then gradually sputter and drop to. Like 525, then the engine just feels rough. I know none of this happened when I first got it.

PS I just want HELPFUL tips or suggestions, main goal is to set up a plan of attack to avoid a 100 shop diagnosis charge to find out that they are just ask F%&@IN confused as me.