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Old 03-31-2010   #11
Paul Workman
 
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Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
Default Re: Idle Flare UP

The backfire, knock sensor, etc makes me think "LEAN". Could be as simple as a vacuum "leak" due to torque (lack thereof) on one of the gaskets. Just for fun, go 'round the plenum and check torque on the plenum bolts. If you find a loose one, then too then I'd think about re-torquing the IH bolts too, if the problem persists. (You did plug the IH coolant holes, didn't ya?) Oh, yeah...My brake booster hose caused that one time: got soft on one end, so I replaced it and idle settled down...Just a thought.

Are you sure it isn't just your tires slipping causing the run-up in rpm? (We've noticed you have a little problem getting traction... But, who am I to say anything, huh???)

Did I mention it intermittently running LEAN?

P.
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