Cars idling rough at stops can have many causes, including damaged sparkplugs, improperly installed sparkplugs or damage to the car's fuel injector, carburetor, vacuum hoses or ignition wires. It is important to take a c... More »

There are a variety of problems that can cause a car's idle to be rough. A rough idle is usually defined by the car idling below its normal speed, loping RPMs, a skipping sound or in a way that causes the car to shake. I... More »

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The two most common symptoms of intake manifold gaskets failing are sluggish acceleration and coolant loss. When an intake manifold gasket fails, the leak causes extra air to be sucked into the engine. This causes a decr... More »

A complete car tune-up includes spark plug replacement, rotor replacement, fuel injector cleaning, a new air filter, a new fuel filter, a new PCV valve and checks on various systems, including fluid levels, ignition, emi... More »

Test the voltage of a car battery when the vehicle is off and when attempting to start it after you disconnect the ignition or fuel injector pump. Batteries should test in the normal range without a load, and the reading... More »

CarsDirect identifies three of the most common problems that cause a car to switch off while a person is driving: broken or worn vacuum hoses, faults in the fuel intake system or an electrical wiring problem. Any one of ... More »

A lit check engine light in a vehicle is indicative of one or more problems including faulty oxygen sensors, leaking hoses or manifolds, damaged fuel injector O-rings, a blown head gasket and a loose or damaged gas cap. ... More »