Ive always found cars can be like people in the fact they have their good days and their bad days. Sometimes I'm driving and I can just feel the car is running poorer than usual. I might feel like it has a grumpy idle or its making a noise a little louder than usual. Then some days its running like a top and I'm like "damn this car is running great today!"

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual