Q: Awful gas mileage, loud ticking, fluctuating RPMs, poor acceleration

The RPM fluctuation, inconsistent idle, lack of acceleration, and poor fuel economy are all consistent with faults such as vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, or a faulty throttle position sensor. An automotive scope can narrow the diagnostic. The root cause can be pinpointed, and the required repairs made, if you request an engine diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.