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I just replaced my head gaskets, studs, injectors, glow plugs, egr delete, and oil cooler. When i wentto start the engine the first couple times it cranked forever before starting. This went away as soon as i drove it for a few miles. The other day i went to start the truck and it died imediatly, retried and it started and ran fine. Now it starts hard and once it is running oil pressure is normal, until it gets to below 700 rpm the the gage drops to noting. As soon as i get the rpm's above 700 it returns to normal???????? any help?