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1993 Chevy Truck runs rough at low speeds

Tiny
BLAZER1979
  • MEMBER
  • 1993 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
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
Monday, August 10th, 2009 AT 2:10 PM

11 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Was it stalling before tune? If yes check fuel pressure
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Monday, August 10th, 2009 AT 2:18 PM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
Just started three days ago
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Monday, August 10th, 2009 AT 3:09 PM
Tiny
DOCFIXIT
  • MECHANIC
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Check fuel pressure 55-61 psi also maybe faulty MAP sensor
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Monday, August 10th, 2009 AT 3:14 PM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
New pump and filter about 3 months ago checking map now
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Monday, August 10th, 2009 AT 3:39 PM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
Unplugged map (at least I think it was) and truck ran great
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Monday, August 10th, 2009 AT 4:11 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
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
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Monday, August 10th, 2009 AT 4:18 PM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
It was in the middle with two hoses
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Monday, August 10th, 2009 AT 4:34 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Does it have three wires? see diagram


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

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Tuesday, August 11th, 2009 AT 8:29 AM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
Not sure how many wires but hose comes from the egr valve the other goes to the back of the throttle body
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Tuesday, August 11th, 2009 AT 11:00 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
That is EGR solenoid so it must be opening EGR at idle stalling engine.
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Tuesday, August 11th, 2009 AT 11:11 AM
Tiny
BLAZER1979
  • MEMBER
  • 7 POSTS
Is that what I need to replace is the silonoid
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Tuesday, August 11th, 2009 AT 11:23 AM

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