My Hyundai shakes a lot when you are in a stop and even when you are driveing, it also uses a lot of gass. Do you think it needs a catalitic?
Clean your air induction system with a product that clean the throttle body without endommaging the O2 sensor!!
You need to spray direcly into the body throttle and the iac entrace.
There is a tell tale light on your dashboard if the cat blows or is faulty, when was the last time it was serviced? if it was a while ago i would think about changing all the obvious first like plugs and leads and oil and filters. if this ahsd been doen and it wasnt such a long time ago then i would recommend that you have you cat looked at.
It might be bad O2, MAF sensor, deposited throttle body, bad spark plugs/wires/distributor cap, clogged fuel injectors or air filter. Shacking usually adressed to uneven detonation in cylinders. Start from cleaning injectrors (injectro cleaner), scanning the trouble codes if any at Autozone store (free of charge), and tune up service (changing spark plugs, wiring, distributor cap)
Hope that helps
Good Luck
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