I replaced the fuel pressure regulator and had the battery disconnected for about 3 weeks. The Blazer starts now and was ideling at 2200-2500 rpm. I looked around under the hood again and found a vacuum line that I had forgot to hook up. Now it idels at 1500-1800 rmp. Could it still be vacuum leak or does the puter need to reset or is there a series of things that need to be done? Thanks.

 

Have you tried driving this car. Get it above 45 for a couple of miles and see what happens. In some of these things a reset occurs at speed.