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97 Deville
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Discussion Starter #1
very hard cold start & runs rough after warming up
I cleaned TB (lots of carbon)
replaced plugs
Temp is fine
at times I have to pull back on accelerator to get moving
stalling
here are the codes (I cleared then drove 60 miles)
P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 1
P0151 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 2 Sensor 1
P0171 - Fuel Trim System Lean Bank 1
P0174 - Fuel Trim System Lean Bank 2
P0300 - Engine Misfire Detected
P1599 - Engine Stall or Near Stall Detected
 

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99 Seville STS, 08 STS4 N* 1SG F55
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3,516 Posts
Check the fuel pressure regulator. Pull the vacuum line and check for gas. Gas present = bad FPR. Also seems like your O2 sensors may be toast but they rarely fail simultaneously. I'd also inspect the EGR valve as that may have carbon buildup on the pintle.
 
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