If I am correct you said you unplugged a vacuum line to MAF and I assume you mean EGR.

The mod plugs it not un plugs it. Now there is a vacuum leak and the waste gate solenoid is not functioning putting you into limp mode. I am surprised there is no check engine light.

Let us know your results.

__________________
-disav

99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete
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76 300D 214K SOLD