Hey everyone

I'v been lookign online to diagnose what is going on with my truck, and i think I may have found an answer. I have an automatic 2wd 95 supercab xlt with a 4.0

Here are my issues-

I have a rough idle, can hear a whistle noise from under the cab, it seems to slam into reverse when coming out of park, and while cruising down the road it seems to be slow at changing gears and sometimes i have to let up on the gas for it to switch.

I've read that it can be as simple as a modulator or a solenoid? Whats the difference between these and how hard are they to replace?

I want to fix this before I go back to school since i'm taking it with me, any ideas or thoughts?

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95 Ranger Xlt Supercab 2x4 Auto 4.0
99 Jeep Cherokee Sport 4x4 Auto 4.0

Anyone have thoughts? Also, when I'm driving in 2nd or 3rd gear it seems to be jolting when I step on the accelerator, but while coasting it seems fine...

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95 Ranger Xlt Supercab 2x4 Auto 4.0
99 Jeep Cherokee Sport 4x4 Auto 4.0

Vacuum modulator operates on engine vacuum .. solenoid usually on electricity.

http://www.ehow.com/facts_6948943_tr...or-valve_.html

modulator is usually an easy fix

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Just when I think I finally have it idiot proof, someone comes along and builds a better idiot..
2011 Ranger XLT 4 door 2x4,4.0 SOHC, Auto, 3.55 Rear. Vista Blue

I have the 4r55e. I've also read that it could be the separator plate gasket? I've looked up how to change it but it doesn't say anything about the whistle so I will look more tomorrow for the where it's coming from.

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95 Ranger Xlt Supercab 2x4 Auto 4.0
99 Jeep Cherokee Sport 4x4 Auto 4.0