How should i buy my car parts? shop or myself?

So i need to buy fuel injection and idle motor for my lincoln town car 2000


and they said something about F1 or ff1 that was related with the fuel injection. Do you guys or girls think that's its better to buy the parts myself and then go to an autoshop to change them or should i let them order the parts and fix it. What about be cheaper.|||This is like bringing your own food to a restaurant %26amp; asking them to prepare it.|||Generally the shop is not going to charge you much more for the parts than you can buy them for yourself, unless your going to a dealer. Also you might end up with the wrong parts.|||Any reputable auto repair shop will not install customer supplied parts. Pay them for the parts and installation.|||Well, a shop may charge you slightly more but since there doing the work, let them go get the parts. They get discounts and charge you retail, not the price there getting it for or even the sale price to consumers. But its easy enough paying another few dollars then to go buy the parts when chances are, the mechanic is going to run into another problem and have to buy run and go buy other parts anyway.|||Some times when you buy the parts from the shop it may cost a couple bucks more. But sometimes by buying parts from them, they will give you a sweet deal on labor costs. And they have warranties on anything you buy and have put in.