I recently put in new aftermarket LED headlights and now anytime they’re turned on while i’m driving my car barely accelerates or doesn’t accelerate at all. I have a new battery and the alternator has been checked twice and is fine. Idk if it’s a wiring issue or fuse issue. it works perfectly fine when the lights are turned off. i know my alternator can handle the power cause they were turned of and on while the alt was being checked. anybody have any ideas? i cant drive at night lmao

 

You don't say if you are in the rust belt or not but if you are very, VERY sure of a good alternator and battery, then you most likely have a grounding issue (lights are taking a different path to ground and perhaps part of the ignition with it.) Many folks forget about their grounds.
By the way, did you put in LED bulbs only, a kit, do any wiring?