Change spark plugs from dealer and coolant temp. sensor
Check for vacuum leaks,your engine is running too lean!,if you add too much air flow to a good burning flame it gets hotter,make sense?,it could be a shut down oxygen sensor.
SOURCE: 1999 vw jetta 2.0
Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.
First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.
SOURCE: misfire after tune up
Since you have a misfire, the fuel in that cylinder isn't burning. Are you sure you have the firing order correct. Also try using one of your old plugs and wire for that cylinder and see if it works. If you only checked for spark at the wire, you might just have a faulty new plug- it happens.
SOURCE: Misfire with error codes P0300,P0302,P01303, P0102, P0748
Have you tried new Spark Plugs? Also after removing the plugs.
Take a paper towel and roll it up so it is like a long thick pencil. Stick that down the hole the spark plus came out of. Just to clean the moisture out. Also blow some compressed air down the hole.
Make sure all the moisture is out. The put the plugs in.
When you wash you car. Be careful if you wash the engine.
Dont let water get in to the plug holes..
SOURCE: spark plug wires
what kind of prob womt come off the plug use needle nose push down to base of plug squeeze and turn let me know hey votr for me ok
SOURCE: misfire in cylinder 3
NO to the MAF Sensor Question, and Spark Plug Wires Or BOOT Will Cause Missfire. As For Mass Air Flow Sensor Easy Check is to Dissconnect it While Engine is Running And If ENGINE SMOOTHES OUT The Sensor is Bad
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