1995 GMC Suburban running poor

Tiny
TB3
  • MEMBER
  • 1995 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
After initial startup idols well, turn off then restart and it floods, black smoke, will run if left alone but if you give it gas it will want to die. It will run an idol fine eventually but if you turn it off and try to restart, same thing happens and gets worse when it up to full operating temp. New fuel pump, new FPR, new plugs, hand code 54 we cleared it it has not comeback in about an 1/2 hr of run time. Any idea

Thanks, Tom
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Sunday, September 20th, 2009 AT 8:01 PM

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Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure and for a clogged return line

Running rich:

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Sunday, September 20th, 2009 AT 9:28 PM

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