Volvo 850 1996 travel 130 kmh heavy vibriation in the car

Question edited for clarity.

In the link

https://www.google.com/search?q=Volvo+Penta+130+marine+engine.+What+is+the+connecting+rod+torque+specs

..

First off you need new bolts as they are one time use stretch to yield bolts.
Step 1 - 20nm , step 2 - 60nm then 130 degrees of bolt head rotation*.

i got the same issue with my car ,it goes away if i down shift and bring up the RPM, my question is would injectors cleaners help in this case ??? please help

11fp-44fp-130 degrees

TCC Solenoid in trans

Changing the fluid won't do anything

I guess the dealer never road tested it
Took your money & ran,as they always do

check for vacuum hoses under the hood that may have small leaks ?

You'll need a torque wrench and a degree tool (most auto parts places sale them) Torque sequence 15lbs, then 37lbs then 130 degrees.

You'll need a torque wrecn and a degree tools (most auto parts stores sell them). Torque sequence is 15lbs, then 37lbs then 130 degrees.

The vacuum res. is a black (can,football,round) shaped item. I do not remember if it is behind the bumper on the pass. side of car. It could also be under the hood on the pass. side. Pass. side under the hood are vacuum lines, follow them, one will go to the res.

Sounds like the park-neutral-park switch needs replaced. Try moving the gearstick forwards and backwards quickly all the way 5 times and see if that helps. If it does, you need the a new PNP switch.