injectors

I have 213k miles on my 2004 LeSabre Limited. Should I worry about changing the fuel injectors? I'm sure they are original. Are they a maintenance item?

A few weeks ago my 1988 LeSabre 3800 began to run rough/misfire intermittently. One minute its running smooth as silk, the next its chugging and shaking like crazy. I checked for ignition problems, all cylinders checked out fine for spark regardless of how the engine was running. I listened to...

We have an intermittent problem. When I press on the gas, the car kind of hesitates--it goes very slowly, the comes up to speed. Two weeks ago, we noticed that there was also the faint smell of gas after the hesitation. The check engine light was never on. We took it to a shop--they replaced...