It is good to check hoses and vacum lines, but please don't start replacing parts without reading the codes. Autozone will do this for free as well as clear the codes. I used to do this until I bought an OBDII scanner. these don't cost much and you can read and clear codes which turns off the check engine light. It is very easy to use. Just plug it in turn the key to the on position and it will do the rest. Once it displays the codes, write them down and then clear them. Once you have the codes you can also just google it and find solutions. I just did this last weekend with my daughters Jetta. Alot of the codes are easy as they will just tell you which sensor is bad. Others can be a little more trick like misfire. there are multiple things that can cause this.