i have a gmc jimmy and the check engine light is flashing what does that mean?

bunk

New member
I have taken it to the near by parts store and allowed them to check the problem and it is telling me misfire and fuel sensor which i believe is as simple as repalcingthe fuel pump but of course it is quite expensive so i have to save but i have never seen it flash and i wanted to know if is something i should be worried about?
 
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