Question about 1991 Toyota Pickup
Sorry Louisbailey this is an incorrect answer. So after searching online for this problem this was my answer to my similar problem. Towards the rear of the engine compartment there is a gold colored valve that has some letters and vacuum hoses coming off it. There was one hose that was disconnected and I found that the idle adjusting screw was backed out completely (this screw is on the left side of the throttle body before the intake manifold). I screwed that back in and adjusted the idle accordingly. All fixed. What was happening: I had an abnormal high idle when cold then as the temp come up to normal the idle would fluctuate up and down when the brake was depressed. This action of sporatic idling is caused from the ECM detecting this high idle condition and trying to compensate with the auto lower idle circuit that kicks in when you depress the brake. I hope this helps as it resolved my problem without replacing any parts. Thanks to all that have posted information for this problem it sure helped.
Posted on Sep 24, 2010
This is absolutely normal with a well maintained broken in engine. the engine is at rest when stopped,so the ecm lowers idle till you drive,which puts the engine under load.if it causes the engine to stumble or die,then replace air filter and set up the idle.
Posted on Apr 29, 2010
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Posted on Jan 02, 2017
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