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Intake manifold leaks will cause the engine to idle rough and get poor fuel economy. An exhaust manifold will have no symptoms other than the sound of the leak.
Check the air filter, fuel injectors, EGR valve and temperature sensor.
Black smoke is caused by excessive fuel in the engine
black exhaust,rough idle, miss in engine,rough operation of vehicle lower performance,higher fuel consupmtion
There can be several things that will cause your 2003 Chevy Malibu to run rough and not shift into fourth here. The probable cause is a lack of fuel. Due to a bad fuel injector.
one of your problems could be in the injectors they maybe putting to much fuel.
When was the last time you changed your O2 sensors? They are supposed to be changed about 60,000 miles. Could be responsible for rough idle and popping in the exhaust. Otherwise it is likely a vacuum hose that is leaking.
white exhaust and rough running usually indicate possible blown head gasket.
sounds like a stuck fuel injector
U have a blown head gasket,cracked cylinder head or cracked block.. The white smoke is from water getting into the Exhaust system.
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Running rich bad fuel injector?