Can faulty egr system cause p0112 or 1297?

Question

Only one code showed up p0402 I found a small little leaks by the EGR valve pipe repaired it cleared the codes. It came up with P0112, P0123.I took manifold off put new gaskets On EGR valve pipe upper and lower.took off the EGR valve and trans reducer cleaned off any build up cleared the codes now it reads P1297 also it doesn't I don't normally anymore like it did the other day. It idles erratically eventually dies I did clear the code once today and briefly P0108 showed up then it started Idol erratically again and code consistently reads P1297

Answer 1

P0108 MAP senosr voltage circuit high

P1297 No change in MAP from start to run

If the vehicle idles erraticaly you have a big vacuum leak, or the MAP sensor is not plugged in, When a code comes circuit high this is a disconnection of its harness,Check the connection of the sensor .