If you have gas in the exhaust then you are running the engine too rich, and too much fuel fouls the plugs thus causing the rough idle. I suggest you look at your 02 sensor(s). They are probably fouled too. 02 sensors send a signal to the ECM as to the air to fuel mixture and the ECM then sends a signal to the injectors as too how much fuel to allow into the combustion chamber.
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.
Runs rough, water coming out of tailpipe if I was a betting man I would bet my last twinki that you have a cracked head or head gasket. water is crossing over into your exaust valves causing the water to come out of your tailpipe and the decreased power in the runs rough is from the compression leak. I am willing to bet that when your engine is running and your radiator is full along with your overflow you have bubbles blowing into your overflow if everything is not full fill it annd check.
if your tailpipe is pouring smoke then you have internal engine problems and need to take it to a mechanic or you need to change your oil
There is no air in line Fuel pump pressursizes line and air automatically bleeds from the injector Not enough fuel or pressure will cause rough start
a coolant temperature sensor:can cause hard starting,stalling,blacksmoke from tailpipe,hesatation,rough idle,surging,cold engine warm up problems,poor fuel economy, the sensor sends a signal to computer!! fuel mixture and ignition timing are also affected by coolant sensor.
The Chevy 4.3 egr system is important to the proper operation of the engine. A clogged egr can cause rough idle or low fuel economy, among other things.
you most likely need an alignment or your tires just need to be balanced
There are many things that can cause a rough idle on this car. The computer could be going out, the engine may not have enough oil, and the engine may not be getting enough fuel or electricity.
my 1990 300zx is idling rough what could cause this?
Because it is studded with ribosomes that cause it to be rough.
It starts by missing and running rough when pulling a load, and worsens until the engine won't run at all.
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
vacuum leaks, stuck or leaky egr valve, leaking intake, bad valves, ect
check the oil in engine to see if it has coolant in itwhite smoke is caused by coolant or water burning with fuelsounds like you have a blown head gasketi would also find a better mechanic
sounds like an injector is bad.
If you know the spark plugs and wires are good, then check for a vacuum leak. The vehicle is 11 years old, and you may very well have a crack in a vacuum hose. A leaking intake manifold gasket will also cause rough idle.
It may have worn spark plugs and or bad spark plug wires, time for a good tune up.
supercharger seals could be bad
Check the motor mounts.
replace timing chain