we have this 1982 supra 1.68 4 it will not start in the morning when still chilly but will start fine in the afternoon when air is a bit warmer. I do not know what to make of this need help bad.

id need more info but, it sounds like a ground or connector.

not sure what your 1.684 is

but i guess it's a 5mge

try spraying electrical crc in the dizzy cap, just a few sprays not heavy... and see how it goes

seems like you have a dampness issue in your connectors possibly ignitor/coil/leads/dizzy circuit... try a little crc on those too

let us know how you get on