Is this ok to have slight shake on idle?
My dashboard says its about 800rpm when I feel the shudder. When I rev up a bit to 1000rpm, it disappears.
I know how it can shake due to misfire, it is much stronger than what I currently have

 

No, it shouldn't shake at idle. How many miles on the spark plugs? Put some fuel injector cleaner in the gas hopefully with PEA, polyetheramine.

 

I can't say for sure the spark plugs mileage, because I purchased the car a monht ago.
But what I can say for sure - engine had a coolant leakage nearby the thermostat-intake connection. Had misfire at 5th cyllinder because of that.
I could have the shudder as a consequence of the leakage and spark plug/coil damage? (no missfire/errors by far)

 

What year model is your truck? Miles on the odometer? And any other details? We like photos too.

 

2008, 137000 miles, 2WD
check my photo album

 

Check to make sure your motor mounts are not rotted out. Although this was on another brand of vehicle I had a lot of vibration when I had a motor mount going bad.