Possibly a sticky valve. Check each spark plug in turn. The plug or plugs which are on the affected cylinder will be a different colour than the others.
Random misfire, cylinder 2 misfire, and cylinder 3 misfire. see related question below.
Its a random misfire detected
answer : Random Misfire
You locate the cause of the random misfire and take corrective actions against that; be it a coil, plug, wire, coil boot or crank sensor. A random misfire is as it states - a misfire that happens randomly in possibly a random cylinder as well. They can be hard to diagnose, as well and it is recommended that you take vehicle to a qualified, ASE certified shop for diagnostics.
po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected po300-Random/multiple cylinder misfire detected. po303-Cylinder no. 3 misfire detected. po306-cylinder no. 6 misfire detected
P0303 is cylinder #3 misfire. P0300 would be random misfire. Either way you need to diagnose the case of a misfire. Check spark plugs, plug wires(if equipped), cylinder compression, fuel inectors, and wiring.
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.
This just happenned to me. I was getting a code PO300. It turned out to be the ignition control module. It cost 78.00 at autozone and only took 10 minutes to replace.
Many possibilities. Plugs, plug wires, coil, ignition module, fuel injector, head gasket. Essentially anything that interfers with combustion on 2 or more cylinders.
Random/multiple misfire detected.
Multiple & or random misfire(s)
Tune up