When I step on the gas in neutral or any gear then back off, the RPMs drop to about 1500 instead of 900. Sometime it will slowly go back to 900, other times I have to rev the engine to get it to drop. I checked my throttle line and it works fine. Iam running a 351W with Edelbrock EFI with MSD electronics. I was told by Edelbrock that the problem could be my coil. Any suggestion
