I have run out of ideas and crap to change. I do a lot of reading. Usually can find the answer. But im at my wits end. Long story short, my Sammy has been at the camp 20 years, last 3 not ran. Brought it home, cleaned up, new paint, new tons of other things!! I’ll do an intro post.. I have been driving to work and back and around here a good bit. I installed a sound system. That includes a Bose head unit, 2 marina water proof Rockville 8’s, 2 Rockville 6x9’s, 2 Bose tweeters, and a 1200 watt amp. When the bass hits my headlights flash, if night, and the motor skips a beat. I guess it’s a miss. It’s a hard dang miss. At full throttle high rpm’s it doesn’t do it as much but mid and lower. It will about make a nose dive. Things I have done. New alternator, not new but swapped out 3 good batteries, 3.5 compositor, new heavier wires, checked and cleaned off main ground wire, and prayed. Help me!