Engine missfires and temp sensor not funtioning

well that code means ur have a missfire in cylinder one change the wires for the spark plugs that really the only thing i can think off beacuse you have already done the spark plugs and the oxygen sensors and the coil packs

is there oil leaking into that plug area?

NEED TO RUN A FUEL INJECTOR FLOW TEST. SEEMS YOU MIGHT HAVE A INJECTOR . IF ALL PLUGS ARE AS THEY SHOULD AND PLUG WIRES ARE GOOD ,FUEL FLOW OR COMPRESSION IS LEFT.YOU CAN TRY MOVEING PLUGS AND WIRES AROND FROM HOLE TO HOLE TO SEE IF MISSFIRE MOVES , IF IT DOES THEN YOU MOVED YOUR CAUSE...

SymptomsSymptoms may include:

• the engine may be harder to start
• the engine may stumble / stumble, and/or hesitate
• other symptoms may also be present

Causes can mean that one or more of the following has happened:

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• Defective computer

Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

It sounds like fuel starved at higher speeds. i would change the fuel filter first if this does'nt help check the fuel pressure

there is actually no camshaft sensor,,,it will set a code P0341 camshaft performance code but there is NO cam sensor,,,,it means secondary ignition is the fault,,,,,like old and worn spark plugs and wires,coil packs corroded,ignition module high resistance,coolant temp sensor bad,crank sensor going bad,those are all the possible reasons for that code,if the plugs and wires are old replace them FIRST also when you remove the wires from the coils make sure there is NO corrosion on the towers,if there is you need a new coil pack,,,,DO NOT use platinum spark plugs,this will cause this code to set,these cars are VERY sensitive to this,,,use regualr plugs like ac delco or ngk but no platinum,,,,,clear code and see if resets

i had that happen plenty of times. be sure that the new plug isnt bad and ohm test or see if you haave spark on the new wire. good luck

I assume you know the problem is a misfire in #2 cylinder from checking the diagnostics code. Although these codes can be helpful in narrowing down a problem they lack specific details. In the case there are several possible items that could trigger the engine fault code P0302

These include:

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• Defective computer

Before you spend any money to resolve this you need to narrow this list down even more. Start by pulling the plug. Do a image web search on "spark plug diagnosis". This will give you pictures of plugs with a variety of problems to compare with yours and give you an indication whether or not the plugs need replacing. Next if possible switch #2 plug wire with another. Make sure you switch both ends (coil end and spark plug end) of the spark plug wire.
These are the no or low cost options. Beyond these you will need to start replacing items like the Ignition Coil and O2 sensor.
If you are still having the problem after checking and/or replacing the items listed above, your next step is a compression test on #2 cylinder.
If you get to this point please repost here with the results with the wires and plugs and I will give you the steps to follow with compression testing.
Hope this helps.

Were the plugs covered in oil? With the plugs that go through the valve cover you might need new seals. Did you replace the plug wires? You need to scan it for codes. It's most likely a missfire, but it could be a bad speed sensor (also called, VSS vehicle speed sensor, cam position sensor,or crank position sensor).

try unplug the up streem O2 sensor drive the car for a while then check the code if its not p0300 change the O2 sensor