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How do you check to see if injectors are firing. If you have had the plenum off, check the back passenager side, underneath, for a vacuum line. It comes off of the EGR valve. Extremely hard to see and get to. I had to use a mirror to see it. When mine came off, the engine ran ruff, idled all over, and horrible MPG. Don't know if that helps any. If MAS is bad you shouldn't be able to rev engine over like 2,000-2,500 RPM's.
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