'88 Pioneer high Rev when cranking?

[Classy Comanche]

So I'm back....again. So I can't tell if I have high idle or not. I notice if I put my truck in gear from park to drive it drastically changes. In drive its normal. When in park or neutral the rpms go up. It is night when I did this experiment but I don't know if I need to park it and have it checked over before I continue to drive it. I'm growing increasingly concerned. I've had plugs, plug wires, distributor cap replaced along with the butterfly valve cleaned. Something else I've noticed is that when I put it in reverse. It jerks. Pretty hard. I have no idea what's going on and I'm considering parking it. Like I said I know it's pitch dark but in going off sound here and wondering what it going on with it specifically jerking going in gear in reverse and why the rpms are up going from drive to park/neutral 

[Classy Comanche]

And here's a separate video that I couldn't post due to the size being to large and posting the other 3. You can hear the rpms go up as I change gears 

[Classy Comanche]

Update: Had a disconnected vac line! Engine was screaming at me while idling. I was playing with hoses and bumping connectors and long and behold this line was dangling and causing my 1100+ rpm idles and almost 2000 rpm cranks! Idles smooth and low now, no jerking when going in reverse. Although I burned almost a 4th of a tank troubleshooting this

[cruiser54]

Gotta love it!!

[pizzaman09]

Yep, a vacuum leak will do that on an engine with a MAP sensor.  

[Classy Comanche]

Oh yeah fun stuff....also had a small tiny little vac line disconnected too. I pulled it up and wedged it between two hoses until I figured out where it went, figured out it goes just slightly above the other that was also disconnected. I drove it a day and noticed almost nothing except for the slightly above average "idle in park" which was not high. But you can tell. So I pulled this hose under my air filter box while letting the engine run and that seemed to be the last peice of the puzzle. It almost seemed like it was idling at 800-825 with this small one hanging free as well

[Classy Comanche]

Hey guys! I wanted to update you all on this thread. So previously I had my plugs, wires, distributor cap and distributor rotor redone in my truck along with a fresh new air filter put in. Afterwards I had a issue with high cranks and revs. Come to find out it was 2 hanging disconnected vac lines which greatly helped the idle and crank. But then I had the issue of it high idling in park. Well I have had the TPS, IAC and O2 sensor redone in one visit. Long and behold it was my TPS! it was going out and the voltage was reading higher than it should have been. I think 0.92? But I wanted to update you guys. Truck runs phenomenal, is quieter, get better gas mileage and runs cooler. Been chasing this for a while. Neither sensor I mentioned above has EVER been replaced. All 34 years old. Now new