On again, Off again
No I'm not talking about that relationship you're in, I'm talking about the “Check Engine, or “Service Engine Soon” light in the dash of your car. I know it was on a couple of months ago, but it has reared its ugly head again. So you bring it to your local repair shop...

The 5 reasons you should do an intake system cleaning on your car
If your car is running rough, hesitating or stalling when it is cold, you might have excessive carbon buildup on the intake valves. We usually see this happening to vehicles with 50K or more miles on them. The carbon is buildup is caused by oil seeping past the intake...