a few problems i having and need help with

[bignasty250]

k, i have started to notice a few problems with my truck. first off almost every time i put my truck into park it revs up to about 1200 rpms and go back to idling, it is driving me crazy. second off the other day i locked it into 4 lo to pull my buddy out of the ditch and when i gave it gas it seemed like it defueled right when the tires were about to spin, what could all these problems be??? i apreciate all the help in advance

[TurboSevenThree]

Mine does that idle up thing but it's only when I'm driving and put it in neutral to slow down faster. It's weird. I don't know why it does it, it does it when the overdrive is off and i slow down. Doesn't bother me though lol

I dunno about your other issue