Well my Check Engine Light comes on, and it worried me so i got my car inspected by Firestone and after the inspection, they told me that i needed to get my Crank Pulley replaced. Everything else they said was completely fine. Anyways, today i had to go get my sister and i noticed right away my car sounded differently...it was lower toned and the engine felt looser. Like, it picks up speed very slowly. So yeah, any help would be nice.