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Hi Everyone, I hope all your problems are fixed by now, but I had the same problem with my 94 blazer. The reason you have to stand on the brakes is because the brake system works with the vacuum created by the engine running smoothly. What I had to do, and it sounds crazy, but to stop I had to apply the gas while braking. This brings the rpm's of the engine up, smoothing the engine out, and allows the vacuum braking to work properly. I cleaned out the egr ports with carb cleaner and replace the egr valve and it seemed to do the trick.
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