Mystery problem. When the engine is warm 'it runs PERFECT"

I bought this truck from someone about a month who had then truck / engine good and warmed up when he sold it to me. It RAN PERFECTLY. NOT A FLAW IN THE SHIFTING, THE ENGINE POWER, firing, nothing!

the next day when the truck was cold, it began with this really really low idling when cranked; then. After in gear; you push the gas pedal and it just waits about a second, maybe 3 before it actually throttles forward. After doing so, its lucky if it keeps smoothly accelerating until it warms a little. Then after warming it runs better and better but still running terrible until its ran about 20$ in gas through it or the "weather is very warm" when its WARM. It runs almost FLAWLESS.

anyway. So it usually being cool weather, I would only drive occasionally between the 3 times I worked on it. The plugs got changed, plug wires, fuel pump, fuel filter, dist cap, rotor, repaired a few small vaccume leaks and fixed the timing, ( which was off almost 10deg) between these repairs of which id pay a mechanic and at the end of the day the TRUCK RAN PERFECT. Until next day, when it was cold and then started over the same thing.
PUSH THE GAS, AND HAS major delay in throttleling forward. 1-3 seconds. If the pedal is depressed too much; it will not do anything at all. When its cold; the shifting is also more rugged but, I think that is just from it being throttled so much before it finally takes off and its almost spinning tires when it finally goes.

BUT, AFTER RUNNING ABOUT 15$ IN GAS THROUGH IT, OR it being over 70 outsided, it will then run FLAWLESS. ANYONE HAVE nyyyyy any idea what kinda weard issue I could be dealing with?