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Sounds like your Piston Valve Rings are bad, I would recommend going to a mechanics shop that you can trust. Check the Better Business Beauro {BBB} for your area and make sure you look at customer reviews before making a decision.
It might could also be a busted head gasket leaking into your manifold, but if that were the case the vehicle would be running hot. either way I would suggest taking it to a certified mechanic, unless you have a brother in law!
Do u put oil in it often? Have u tried the oil pump? If u r losing pressure but not oil then u just may need to get a new oil pump. Their really easy to change.
Replace the O2 Sensor and if that doesn't fix it your going to have to start replacing the stuff Identified by the codes. Most likely the Catalytic converter is bad and the Crank Position sensor. If the Crank Position sensor is sending faulty signals then it will cause misfires, the O2 sensor causes the motor to run rich, the Catalytic converter will become overheated if your running too rich or it is damaged or partially blocked.
Sounds like you have a plugged up catalytic converter. You cant clean them it will need replaced. If it is the 4cyl engine, the converter is the exhaust manifold on the front of the engine.
Most of the time if it was a fuel pump it wouldnt start at all.Sounds like a tps problem.If there is a check engine light on, it would probably be cheaper to pay someone to scan it, instead of guessing and buying
sensor after sensor.Some of them are quite expensive.
Hope i was of some help
burned exhaust valve possibly or you could have it wired wrong. Timing also could be an issue. I know this doesn't help you much but a compression check will tell you if it is a valve.
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