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Glad the heater hints seem to have helped.
The shaking gearstick problem you cite may well be addressed in another thread (anyone here seen such?), but I agree that it sounds like a misfiring problem.
Given the engine is transverse mounted, any hic-cups / coughs and splutters will result in the engine rocking itself sideways and hence macking the gear lever jump about in an up / down & front to back direction.
Causes can be many and various - but first port of call is usually plugs / leads / distributor cap - i.e. ignition electrics.
(in passing - you hadn't driven through a large puddle or similar just before had you? - water sprayed over the ignition components can cause a ragged, jumpy misfire).
Others may want to advise further - but I know our Laguna 1.8 RT HATES water on the cap and plug leads.
Failing that - if it persists - fuel problems can cause similar effects.
Currently in spirochete's garage:
Jaguar V8 Sport / Mercedes 'E" / Laguna 1.8RT