Go to Advance Auto Parts. They will plug the computer that pulls the code out of the computer for you at no charge. If you try to have them do that at any mechanic shop it's 50-100 bucks. Then you'll know the problem and go from there.
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If you know the plugs are fine then an ignition wire or a coil will cause the same symptom . If you had a code reader it would show you which cylinder is causing the miss. Beyond that a compresion test is needed.
The code you have P0780 is an internal hydraulic problem in the transmission. I did some research on this trouble code and the repair manual Say's to replace the torque converter clutch solenoid valve/shift solenoid valve A, and the A/T clutch pressure control solenoid valves A and B.
In plain English these are the shift solenoids and torque converter solenoids. These solenoids control the fluid flow to the transmission and if they are not working properly then p0780 will set.
The bad news is the repair manual Say's to replace these solenoids and if the problem is still present then replace or overhaul the transmission because the problem is internal.
Most repair shops are not going to take the risk and just replace the solenoids, they will replace or overhaul the transmission.
The oil light is reset by the tech on each service. It will not go off by itself. As far as the check engine light goes you now have a code stored and you will need to get it before we can begin to diagnose. Only thing you can do is make sure the gas cap is on and the seal is no cracked or distorted. This could set a code
Cleaning the fuel line was a good idea although it will need time to take effect. Another related problem could be clogged or stuck fuel injectors. Another thing to do is pull the spark plugs. Old or dirty spark plugs also contribute to engine sluggishness. Lastly, bring the car to an autoparts store that features free diagnostic tests. If there are any error codes stored on the car's computer, it would give you an idea where to look for any electrical problems.
the light can be caused by any one or combination of over 200 trouble codes, go to any kragen or Autozone parts store and ask for a trouble code test, it is free, then record the code(s) they come up with and post them back on fixya