2005 Chevy Silverado my duramax is missing and blowin black

2005 CHEVROLET SILVERADO
120,000 MILES • V8 • 4WD • AUTOMATIC
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HALF TRACK
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i hada return line get broke replaced it and now it wont staighten up could i of done something wrong it seems its only runnin on 7 im clue less with this and will and does smoke worse than a chimny i changed the fuel fuelter ran injecter cleaner thrue cleaned the air filter and it just not improving what would be best to do
Mar 25, 2010 at 1:46 AM
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RASMATAZ
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Defective fuel pressure regulator, leaking injectors, excessive fuel pressure due to restriction fuel return line and coolant temperature sensor stuck in open loop mode and oxygen sensors
Mar 25, 2010 at 3:05 AM
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