Q: Slow accelaration

You do not mention a check engine light is on so a computer sensor may or may not be the cause. The throttle body (https://www.yourmechanic.com/services/throttle-body-replacement), air filter (https://www.yourmechanic.com/services/air-filter-replacement) or fuel filter (https://www.yourmechanic.com/services/fuel-filter-replacement) may be dirty and restricting air or fuel...

If in fact the headlights and the shifting issue were a result of changing the battery, the only circumstance that I can think of would be a voltage spike. Was the ignition key on when you connected the battery? Did...

You may have a faulty throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement) that is causing a jerk when accelerating or erratic idle. Have the computer scanned to look at codes and data from the throttle position sensor for a good closed throttle position...

This is probably not a problem. If your state or locale requires emissions testing (https://www.yourmechanic.com/article/how-is-my-car-tested-for-emissions), this will be an immediate way to determine if the engine is running too rich (burning too much fuel for a given amount of air)....

Removing the muffler will not decrease the horsepower, but instead it will create less back pressure on the engine, making the engine breathe a little more. Make sure that the exhaust will not be too loud for the zoning laws...

Hello, thank you for writing in. There may be several components you will have to inspect before you find the issue. You will want to start with the distributor cap. Make sure it is clean and dry inside. Jerking when...

The fuel pump in the fuel tank is most likely leaking fuel where it hooks to the fuel pump housing. I recommend replacing the fuel pump in the fuel tank.

Hi there. The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drive train and the throttle pedal is not being depressed. When an engine is running at idle...

Although the transmission type is the same (U140-E), the two vehicles have different Tag ID numbers on the transmissions and thus the two referenced transmission are NOT listed in the catalog as "interchangeable". Different Tag ID's reflect differences in electrical...