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engine rubber mounts or timin out
Check your motor mounts.
It maybe a leak in the intake manifold gasket.
Its either timing or fuel intake problem.
if it shakes while your braking your front roters could be warped or if it shakes while your driving try balancing the tires at a tire shop.
while driving yur car reduces speed then pulls off with speed and backfires what can cause that
you will need a front wheel alignment
You may have a ball joint going out or your wheels are unbalanced
If it backfires while you are driving, the intake manifold bolts may be loose or the gasket may need to be replaced. If it backfires when you turn off the ignition, the fuel mixture is a little on the rich side.
Carburator problems -- dirty gas -- water in gas
If a Kawasaki 650 Prairie backfires and bogs down while driving, this may be due to old battery. It is best to change the battery and clean the filters, too.
probably a bad camshaft sensor.