Having problems with your 2003 Chevrolet Blazer ?
Service engine light came on after an oil change and now it is shaking and not running smoothly
Take a look under your hood at the air filter housing and the hose going from that to your engine. Make sure there are not any wires not re-attached to this hose. There may be an air flow sensor that was not reconnected after your air filter was checked. If you had your oil changed somewhere I would take it back and ask them to take a look at your vehcile and see if they can figure something out.
Repair Help & Product Troubleshooting for 2003 Chevrolet Blazer
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