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A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044
often a car at that age may need new spark plug wires if they are still original make sure all the spark plugs are good. if it accellerates ok for the firist 10 seconds or so then losses power it may be just a fuel filter , keep it simple firist
Im not sure if that is the issue or not. It is possible but before I would tell you yes, I would want to know if you have changed the following as it is requested in routine maintenence.
air filter and fuel filter?
routine services? have they been done?
2005 really should not require spark plugs unless you have driven 100000 miles already.
If the answer is yes to all I have written. i would indeed check the
plugs but also consider checking air filter look inside throttle body with the hose off to see if it blackish looking, also try to put some fuel injection system cleaner in your vehicle with at least 3/4 of a tank of fuel.
You may even consider haveing your fuel pressure tested. These are things to always consider when it comes to hard starts.
This car has seporate coil packs for each cylinder, have you tried swapping the front bad one with a good one to see if they switch ?
The engine you just put in may have come with some blown coils.
Hope this helps
When was the last time the spark plugs were replaced? They sell an "Engine starting fluid" that you spray directly into your air intake hose to aid in the occasional start-up problem. Have used it before, works very well.