If the shaking has been progressively getting worse i would start by checking the engine and transmission mounts for rips or tears. Smelling fuel and major loss of power would suggest that you have a fuel leak somewhere. The sending unit its self is a culprit that can be hard to locate so if in doubt check it as well.
SOURCE: rough idle - white smelly exhaust
the roughness at idle is the shocks .replace the shocks. i had the same problem
SOURCE: 87 Supra idles rough and dies out
I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.
SOURCE: my 1995 mercedes S500 idles rough, and no power.
I had a similar problem with my 1994 S420.
Before taking it to the shop check the following:
Distributor covers, Rotors and Spark Plugs. That's what my car needed. Before I did it two "specialized" MB mechanics wanted to replace the engine wiring harness ($1,000.00) and the other wanted to replace Air mass sensor, throttle valve actuator ($2,000.00) I hope that's all you need.
Testimonial: "You hit it on the head. Had same problem with my '95 S500. diagnosed as bad fuel rotors. Explained to me there is one per cylinder, and were all origi"
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