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1990 Pickup with idling problems...
I have a 1990 Pickup 4 cylinder with the 22RE engine and automatic transmission. It has just 42,000 miles on it. It has been tuned up recently.
The problem I'm having is that when I'm idling with the A/C on and my foot on the brake, the engine idles very roughly, like the RPM is going up and down.
If I remove my foot from the brake or turn the A/C off, the problem disappears immediately every time.
I'm thinking this is some sort of vacuum issue since both the A/C and power brakes have vacuum components, but I would like some ideas about what to check.
Does anyone have any advice/suggestions?
Thanks
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