No choke...but you need your O2s to cycle when hot?
I'd probably try NGK v-power plugs and spiral core wires. Clean the injectors and check all the other sensors. Basically a full tune up.
Then I'd flush the oil and change it using an additive. Do a carbon clean using water or seafoam. Change out/flush the trans/diff oil and use an additive. Up the tire pressures some...to the point your truck will corner and not slop.
Then I'd go racing....

I want better mpg....