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I think it could be a coolent problem also. I had the same problem and it was the T stat. Watch your temp gauge, from a cold engine it should go up to 180' (just to the left of the center of the gauge) and stay there. If it does not go up and stabilize as described replace your T stat. My T stat was adjustable and I adjusted it with the screw on the end of it to fully close when cold. Mine was cracked open even when cold and that allowed some water to flow thru causing a very slow warmup and erratic coolent temp. The EACV uses coolent temp to set the idle and if the coolent temp is eratic so will be the idle.
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