97 blazer 4door 4wd running rough and hard to accelerate, starts to shake after accelerating past 25mph, relays have been clicking alot even after replacing the ones in the glovebox also the head lights flicker on and off, horn honks itself but when the horns are unplugged and the button is pressed the relay clicks as if its working properly, also showing two p0740 codes for the torque converter, p0753 for shift solenoid A having an open circuit, p0758 for shift solenoid B having an open circuit, and p1860 for the torque converter, also the key would not turn back fully to lock/release position in the ignition and had push in the solenoid for it to fully turn back all lights exterior and interior dim when i press the brake pedal as well.......so far i have tried to replace the three relays located in the glove box for the horn, drl's, and the fuel pump; mechanics ive talked to say it sounds like a new computer but someone else says its just a bad ground even though ive checked all my grounds and they are tight and there are no exposed or loose wires...previously i had replaced the heater core and when placing the dash back in and hooking things back up i had two identical plug sets switched around causing the car not to start as well as the ignition not going to the release position and when trying to read the codes there was no power to the port and we had been using a battery charger and trying to jump start it thinking it didnt have enough battery power from sitting with the interior lights on