When i start my truck it starts great. Idles great. Sounds normal from what i can tell. My problem is when i put the truck in gear and take my foot of the break it starts shaking( not touching the gas) but the truck will still move on its own. The shaking seems to be worse in reverse then forward, but that might just be because when this happens i am usually in reverse.

This happens when pulling out of a drive way or spot. Once i get it on the road it runs fine. If i shut it off and turn it back on its fine. Its like it only happens when the truck sits mor then a couple of hours. The shaking almost feels like a misfire.

I know its not the gas. I had a problem withe the plug wires throwing a code a few months ago and replaced only the 2 that were giving me problems. On sunday i replaced the rest exept 1-the one at the back passenger side. It wont even throw a code for me. This happened before sunday as well. I also cleaned the throttle body sunday. Had negative battery cable off also.

What could this be. Sorry for the wall of text... typing this on my phone and it wont let me edit. Sorry. Thanks in advance

 

is it giving any codes? could it be the TC.

 

A shake like that is one or more cylinders missing.
Either from a coil, a fuel injector plugged or a spark plug/boot.
You need some one to put a good scanner on and look at the live data and try to trap the fault.
Good luck.

 

No codes. What is tc? Any other opinions? Feel free to chime in

 

TC = torque converter

 

UPDATE: The truck has sat for about 20 hrs now, I had to move it so I didn't get a ticket, I only moved it back and forth a couple feet and absolutely NO shaking.

This is confusing.

Thanks for all the help and still open to more suggestions.

 

has it been raining? then stopped? sounds like you might be getting a coil wet..

 

It rained Monday but it was nice out all weekend and it was doing it last week. Today after the truck sat for about 15hrs I got in it to go to work and it ran fine. When I got to work (the last stoplight) it started to idle a bit rough (barely noticeable- hardly at all) and for only a minute I would say, then went back to normal.

This is starting to annoy me. Should I try a coil or something else? still no codes...

BTW thanks for all the suggestions and help.

 

Some things to do and look at.
Clean the IAC to be sure it's not sticking.
Look for a leaky heater hose in the area of #3 and 4 cylinders dripping on the coil and plug locations.
Look for a leaking signs of a cowel seal gone bad or out of place.
It's normal to idle rougher with a fault when in gear.
The torque converter puts a load in the motor.
If the IAC cannot account for the extra load by opening up for more air it will act funny.
Also pay attention to what happens on decell.
If the idle is not picked up by the IAC, that is a problem.
These items may not set a code.
Good luck.