Why is my car engine shaking?

Bring it into the dealer. I had the same problem with a Maxima that I owned. It ended up being something with the cylinder. It was a pretty serious problem and I ended up getting rid of the car. It would have cost almost as much if not more to fix it than what the car was worth. Take it to a mechanic someone you trust and who knows what they're doing.

You can have your motor-mounds checked sometimes if that's broken your engine can shake violently if that's what it is its a relatively inexpensive also if that's what it is try not to drive it your engine can fall out from under your car.

If I had to make a guess from what you describe it seems you have a very bad vacuum leak somewhere. Look for a hissing or sucking noise if you can get the car to idle while you look under the hood.

Usually when the SEL comes on the diagnostic system needs to be checked via a scan tool for best results. Do you have a scan tool? Do you want to try to fix it yourself? If so, you will need to get a Scan tool, and a Suzuki Factory Manual. The fact that you changed something and it in turn fixed the problem is interesting and I can see why you want to dive into this thing and fix it. Did you change the air filter? Stan

You might try finding an engine manual for your car,look in local library for a CHILTON'S automotive book or try www.justanswer.com.This web site is manned by auto mechanics and guarantees to give you the correct answer.There may be a small charge but check out the web site to see for sure.You really need to know what the codes are that caused the engine light to come on.Go to an auto parts store like Auto Zone and see if they will a free diagnostic check.