Hi, I own a 96 850 turbo.
I have two codes, P0103 and P0172. I'll go back a few months,the vehicle started shaking severely when stopped at a light especially when the AC was on. If I turned the AC off it would stop. But when I drove at a constant speed it was fine. I replaced the PCV system hoping it would fix the problem. The PCV system was blocked. The check engine codes went away.
Fast forward, the codes returned a week later and the intermittent shaking. What could this be. I dont think the MAF sensor would make the vehicle shake. or am I wrong.
Your help appreciated.

 

Either you have a huge vacuum leak or a bad MAF.

 

how do I check if I have a huge leak.

 

A really big one you should hear. A smaller one you can spray Carb cleaner around all hoses and intake manifold. If the idle changes you found the leak.

 

I would definitely check all the vacuum hose connections at the vacuum hose "tree" by the distributor.

 

so today I ordered a new MAF, hopefully this will fix the problem.

 

I hope so as well. If you have no leaks at all that is the last thing it could be.

 

Got my MAF sensor today and installed it, went to Autozone and cleared my Check engine light. So far so good.

 

Spoke to soon,
My check engine light came back, now I just have a P0172 code. Fuel system too rich for bank 1. Is this a Oxygen Sensor issue? On the bright side, the vehicle does not shake any more, and seems to be running better.

 

It may be the O2 sensor now.