Missing at idle after warmup. $10 to you if prob. resolved

I have a 88 D50 2.6L 4x4. New head, plugs and has the weber upgraded carb. Upgraded to the Carter electric fuel pump, new filter. Starts fine, drives down the road fine. When warmed up it has a nasty mis to it at idle only. Any ideas where to start? P.S. Cap is good and rotor. Timed according to OEM specs. Platinum plugs gapped at about 42. Thanks in advance. I'll try your advice, if it works I'll paypal you $10 bucks.

Just thought but you may want to try taking the dizzy apart
after 20 years or so the grease they used In them gets gummed up and trust me it will miss when it get hot so just remove it blow it apart clean everything and regrease and if it were me id close the gap on the plugs to 40 hope it helps

new plug wires? vacuum leak at carb base or vacuum lines