Old School "Gale Banks" twin turbo set up. After cruise, returning to idle the RPM's stick about 2000 rpm's. Shut the engine off and re-start, the idle returns to normal. No hard re-start, quick fire-up. This doesn't happen all the time but can be dangerous. Doe's anybody have any thoughts to try? Or what to look for?
*Note there are clamps on the intake hoses in picture #2.
Any help would be greatly appreciated!