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First, do you hear a click or anything when you try to start it with the key?When it is running, any check engine light on?
Interesting, i am unaware of a fail safe that kills 2 of the cylinders. Do you have the transmission code available?This could be why there isn't any sound when you try to start it with the key.
Wondering if it's possible for you to give me the actual P codes?
Ok, the neutral position switch is casing the 1507 code. The car thinks it's in neutral when it's in gear so the computer thinks you are getting high rpms when you are driving.
It is possible there is a starter issue, however I think I would start with the clutch safety switch, just to see if it's a factor for why the starter is not even clicking when you try to start the car. You can unplug it and jump it. I would like to start there to see if it makes any difference because the car will run, even though it's not great when you pop start it. So, please give this a try and let me know.