1985 NAPZ 720 problem

[808countryside]

I have a problem with my truck back firing, but it only happens on the beginning of my day... every morning before i go to work i warm up my car for about 5 mins. as im driving out to the main road. the truck starts to backfire! as i keep on heading to work the backfire seems to goes away.. what could the problem me? i think it might be the air/fuel mixture, but i can't locate were it is on my carburetor? can anyone help me..

thanks

[PEZi]

this is relatively common for the stock Z24.... i haven't heard of anything that actually fixes it yet

mine used to do it before i got my new carb... and i know nissanboy85's truck did it too... he even has video of it from when he was trying to figure out what it was, but i don't remember if a solution was ever found