Pulling codes - Please help!!!!!!

[2FastLX]

Just hooked up a scanner to my car and got 34, 66, and 91.
34 was EGR valve position, sensor or pressure.

66 was Mass air sensor voltage too low.

And 91 is O2 sensors, which I already bought so this one should go away I hope.

Any thoughts?

Here are the mods that would have anything to do with this...
• 76mm C&L MAF
• 24lb SVO injectors
• Walbo 190lph fuel pump
• 65mm Explorer TB
• MAC cold air kit
• K&N air filter
• GT-40 intake
• Ported stock ET7E heads - 3 angle valve job - shaved .030
• F303 cam
• 1.6 roller rockers
• Crane valve springs
• MAC 1 5/8" long tube headers
• MAC 2 1/2" Pro Chamber
• MAC 2 1/2" cat back with chrome tips
• MSD Blaster coil
• Taylor Spiro Pro plug wires

Thanks!

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Too much to list. Best ET on the car so far with stock 2.73 gears - 13.73@102mph

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