Hey guys when I put my truck into park from drive the rpms go real real low, sounds like it wants to stall but it doesnt. Just got the truck, its a 97 3.9 2wd clubcab. I just got new plugs and wires for it, and i'm going to clean the fuel injection after I change the oil.

 

heres a quick test to run. shift from drive to neutral and see if it does the same thing. if it does i suspect something involving vacuum, possibly the pcv valve. check your lines and make sure the pcv valve is working properly