Maybe you can guide me here. I installed a Blackwing several weeks ago with and upgraded Air Bridge. A little prior background as well. The previous owner had a halltech tric or trap on there and there is now the cut out where it went through. When the previous owner sold it he put back on the stock. When I removed the stock I found that it had previously been modified. I installed the blackwing over this hole. Also the previous owner put Z06 style screens around the fog lamps.

The only problem I noticed off the bat was my fuel consumption went way up. At the same time several forum members mentioned that a upgraded air bridge was not really necessary unless I was doing more perfomance mods to the engine, which I am not. So I returned the air bridge and put the stock back on but with a new tappered silicone coupler instead of the stock accordian. Now when I drive, fuel consumption is normal but when cruising let say at 70 and then coasting to about 55, as soon as I hit the 55 mph range to about the 45 or so, the car shakes or hesitates. (engine braking).

I did a idle relearn: Disconnected the battery for 15 min., started it with everything off and let it idle for 5 minutes then a another couple of minutes with the AC on. Didn't help. I have another idle relearn procedure that is different which I am going to try.

The only other recommendation was that it might be a vaccum leak. I will check the connections this weekend.

Another member from another forum suggested that I had to cover the hole that was made from the installation of the halltech because of the hot engine air and cold air mixing throwing the PCM off. Was there any kid of whole their originally on the stock setup?

Any thoughts on the matter?

Thanks!

Chris