My 2000 Corolla is missing out badly when I accelerate

My 2000 Corolla is missing out badly when I accelerate. It’s also getting really bad gas mileage. I took it and got the computer scanned, but there were no trouble codes (the check engine light does not come on at all when this problem occurs.) What could be wrong?”

Well, theoretically there could be lots of things causing that, but most of those problems would set the check engine light and store a trouble code. THE most common problem in a Corolla like yours which would cause bad hesitation is a dirty or worn out mass aiflow sensor (or MAF sensor.) Try having it cleaned out with MAF sensor cleaning spray, and if that doesn’t work, replace the sensor. They are simple to replace, any auto parts store can sell you one and show you where it’s located (two screws remove the sensor.) Since these sensors go bad quite frequently, they are easy to purchase as many people now sell them.