1993 Chevy Truck runs rough at low speeds

1993 CHEVROLET TRUCK
200,000 MILES • V8 • 4WD • AUTOMATIC
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BLAZER1979
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starts and idles fine but when the throttle is depressed slightly runs rough and wants to stall did a tune up about 3 weeks ago
Aug 10, 2009 at 2:10 PM
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DOCFIXIT
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Was it stalling before tune? if yes check fuel pressure
Aug 10, 2009 at 2:18 PM
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BLAZER1979
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just started three days ago
Aug 10, 2009 at 3:09 PM
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DOCFIXIT
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Check fuel pressure 55-61 psi also maybe faulty MAP sensor
Aug 10, 2009 at 3:14 PM
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BLAZER1979
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new pump and filter about 3 months ago checking map now
Aug 10, 2009 at 3:39 PM
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BLAZER1979
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unplugged map (at least i think it was) and truck ran great
Aug 10, 2009 at 4:11 PM
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DOCFIXIT
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If it was on right valve cover to the rear and had a hose attached that's it. And pulling hose it runs good is the test. Extra desert for you tonight
Aug 10, 2009 at 4:18 PM
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BLAZER1979
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it was in the middle with two hoses
Aug 10, 2009 at 4:34 PM
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DOCFIXIT
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Does it have three wires? see diagram


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_39.jpg

Aug 11, 2009 at 8:29 AM
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BLAZER1979
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not sure how many wires but hose comes from the egr valve the other goes to the back of the throttle body
Aug 11, 2009 at 11:00 AM
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DOCFIXIT
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That is EGR solenoid so it must be opening EGR at idle stalling engine.
Aug 11, 2009 at 11:11 AM
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BLAZER1979
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is that what i need to replace is the silonoid
Aug 11, 2009 at 11:23 AM