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Re: EGR Valve !!!!
When the egr valve on my 350 Chevy Silverado was going, I had the same symptoms that you are mentioning. I also noticed that I would loose servo brake action sometimes and the brake pedal would be very hard with no power braking action. The engine would stall when driving slowly. In the end the truck became undriveable I messed around changing the MAP sensor and IAC per the shop manual until someone told me that it was the EGR valve. After I changed the EGR valve I had no problems.
What computer codes are you getting?
Mark
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