The "check engine" light won't

This light is indicating the ECU has picked up a problem with the fuel injection system. It can be anything from a faulty oxygen sensor to a faulty speed sensor, you need to have the vehicle scanned for fault codes at diagnostics centre. I recommend finding a good workshop, as some places will scan for the fault, replace what the car is saying is faulty without checking it properly and the fault still remains. This leads them on a parts swapping frenzy until the light goes out.