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Chevrolet Malibu: My 2002 Chevy Malibu is running roughly.

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My 2002 Chevy Malibu is...
My 2002 Chevy Malibu is running roughly. Check engine light started flashing on the highway, and the car was shaking badly when I came to an idle. Took it to the shop, he suggested replacing the spark plugs and wires. I did that, out doesn't run as roughly but the light still flashes when I go over 35mph. He said something about a vacuum test.
Submitted: 2 years ago.Category: Chevy
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Answered in 22 minutes by:
6/19/2015
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,580
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello, my name is***** we begin can you tell me if you know which codes the computer is giving?
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Customer reply replied 2 years ago
I'm not sure the codes, he said engine misfire and emissions.
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago
If it is flashing then it is a misfire. Since you replaced the plugs and wires and it is continuing then it can be caused by a fuel injector or an internal compression issue. I would do a compression test to see what is going on internally.
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Customer reply replied 2 years ago
Got the codes read at O'Reillys. They are: p0302 cylinder 2 misfire p0300 anyone misfire and c1225 wheel speed sensor circuit
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago
Thank you. Since you have a misfire on a particular cylinder then you need to determine why. I would do a compression test just to make sure that the engine is fine internally. If it is then you more than likely have a failing ignition coil or you have an issue with the fuel injector on that cylinder.
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