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EGR valve can be take off and cleaned, but what it sounds like is the fuel line to the injectors are leaking,put a pressure gage on the fuel line and see if it holds pressure when the key is on. it should reach 60 psi and hold for about 5 seconds without dropping. If the smell is fuel I would suspect the inlet fuel line is leaking. When you take the upper manifold off, which is easy. 10mm socket will do. If you see a clean area on your intake and the rest is dirty. its leaking. Just turn the key on, don't start and see where its coming from.

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Q: How can you tell the difference if the CPI or the egr valve is bad on a 93 GMC jimmy It stalls hestiatesidles rough and there is a strong odor.It is not getting good gas mileage either?
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