search the code numbers and then go from there as far as what they are...most have been covered somewhere on the site. Could also go to autozone or somewhere and have them read the codes to see what they are then start from there. I searched up 43 ignition control circuit not responding. I'm not good with electrical so someone else or maybe search around on that.
If i had to guess for a start. check all grounds and fuses and look from wires that are chewed, melted or stripped.
"washing it inside and out is on my to-do, eventually, maybe, if I have time, OOOH angle grinder."