Quick question before I make the doctors appointment for my 575 and put on the computer.

It has been running fantastic up till yesterday - I was cruising along when I thought it sounded like the motor went flat on me - Went on my way but later when I left the local restaurant, and getting on plane, it was like running on 7 -- then i could fell it surge and pick up a little, then fall flat again

I changed plugs today and not much better -- it was running super rich at idle after i came in from a test run - could barely hit 80 mph on the run -- ran 87.4 the other day in cooler air and 12" chop but it should have run at least 84 today (i am running more boost than stock)

Anyhow -- anybody know if it is a map sensor or what ???

The dealer can install a dual iac set up and a remapped brain-box it is fix offered by merc hi perf. I worked a twin 575 that were going thru plus like crazy (super rich)