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You need an OBD2 scanner to read fault codes stored and indicated by the Check Engine Light. Entry level scanners are available for around $20-$30 at most auto parts retailers.
The codes merely identify the problem area and are not a diagnosis. Further troubleshooting is always necessary, else it is only guessing and parts swapping which may cause more problems than solved.
The code that has been set is a crankshaft to camshaft correlation code. This code set if the distributor is out of sync with the crankshaft timing. Check the distributor gear very closely, it can become worn and create a timing issue for this engine.
codem p 0203 refers to injector 3---circuit malfunction===causes wiring--injector--ECM
chweck for harness connection , bad wire for no 3 injector or corroded pins for no 3 injector in the connection
That is known as limp home mode it sounds like you have a trans code you will need to have diagnosed.Sometimes getting the code cleared will take care of the problem until code sets again.
Take your car to the dealer, local garage, auto parts store and get them to pull the code which should tell you exactly what the problem is. I would also check the transmission again and make sure it isn't leaking and is at the correct level. If the problem was low transmission fluid you still need to have the code "cleared" before the car will return to normal. Hope this helps.
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