Check your spark plug connections and spark plugs. If necessary, replace them.
P0303 : misfire cylinder #3
Cylinder #1 misfire.
Was an intake manifold gasket for me.
Auto Zone will check your computer codes for FREE...
In the past I have had an engine misfire due to a bad fuel injector. hope this helps.
Could be a bad ignition coil each cylinder has its own
Could be a few different things. Spark Plug, plug wire, coil, injector, ignition module (these are most common) Head gasket, cracked intake, mechanical (ie valve,piston,cam etc) (less common)
po301 means cylinder 1 misfire
my 2002 alero is missing and has no power what could b wrong
on the right side of the engine block.
code p0302 is cylinder no.2 misfire detected
Its a misfire detected on cylinder No. 2