I have had a tuneup done replacing plugs, wires, and air filter. The engine shakes at isle and accelerates roughly. There is little power as well. I have an engine code showing P1491 for a check engine light and have different reasons for the code - Fan relay or emissions control module. I need some help in troubleshooting this issue.
Here are a few things to check that aren't that exspencive to do. check you'r o2 scener and the map scencer.try tapping on the cadiletice convertor to see if can hear any rattling if there is any rattliling the cadiletice converter could be clogged and will need to be replaced.You can also have the emission control module tested to see if it working properly.
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Outlook loss of power when trying to accelerate. First hesitated from a stop, eventually engine light can on and vehicle would not move. Lots of transmission issues with the vehicle.
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