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Code:P0101Modules:ECM, PCM Description:Mass Air Flow (MAF) Sensor Performance

Code:P1406Modules:Description:Exhaust Gas Recirculation (EGR) Position Sensor Performance

Any thoughts on what might be causing these codes?

A little history....

When I was putting the upper intake back on after changing the injectors on the passengers side I accidentally crushed the line from the EGR solenoid to the EGR valve....DOH! I replaced it with some smaller tubing that I had and thought it was working fine. About a week later my SES light came on. I took it in and had it scanned and came up with the P1406 as well as P0400 (Exhaust Gas Recirculation Flow Malfunction )
I figured the P0400 was from using tubing that was too small and not allowing the proper amount of vacuum, so I replaced it. All was good.

A week or so after that the light came on again and went out before I had it scanned.

Yesterday the SES light came on again. As luck would have it, my cheapie fleebay scanner arrived today so I put it to work and came up the the P0101 and P0400.

All the while, my truck has been running fine.

For the MAF code, could that be because I had removed the filter box? I just intalled it again, so we'll see if that takes are of that.

I've cleared the codes. Is there any thing I should be looking at or testing?

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