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yep another irratic idle one

Hi

Had trouble with high idling so checked tps connection and voltage which was ok but found ecu(water temp sensor plug was so badly corroded that i had to change it. Now i have complete opposite, idle is fine at 800rpm but keeps dropping down to about 100rpm for a couple of secs rises for a few secs then drops again. Any of you clever people got any ideas

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    sounds like the base idle is set too low, adjust the screw on the valve (right rear of the plenum)

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