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We just purchased our first 2013 duramax diesel 2500 HD. We are having some problems with it. We have changed the fuel filter, glowplugs and did a seafoam flush. It will run super good at times and at times it will run terrible, when it is not running good it is white smoking and you have to pump the gas to get the rpm over 3000 once you have pumped the gas and it gets over 3000rpm it will set you back in the seat but once you stop or want to accelerate you will have to pump the gas again. We took it to the Chevy dealer they said it is the injector pump and want 8000.00 to fix it. We were told that there is only 2 ways to find out of the injector pump is bad we dont believe the dealership did either of them. I just wanted someone that knows a little bit about diesels to tell me what they think. Please help and Thank you