Q: diagnose codes

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we have a chevy uplander that is getting four codes p0401,p0402,p0502,p0503 could egr clogged up cause the other codes,about a week ago it acted like it shifted funny but i was almost out of gas put gas in abnd it was fine til a week ago ,fluild was a quart low and now when driving it seems to shift up and down on its on.

My car has 130000 miles.
My car has an automatic transmission.

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