Mid-range power loss

[Arith]

Every time my car's exhibited rough idle, it was due to a loose vacuum hose. Had the Phat man inspect all my hoses and he found the detached one, plugged it back in, car ran like normal again.

[Boxer]

For $29 or whatever the ebay cables are and free software I'd start there. If you know someone up there with an ECUdatascan it can do it too

^ This

Learning View and ECUdatascan are worth their weight in gold. Mine get regular use