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Q: Engine Performance on 2000 Chevrolet 3500 Pickup

Have had checked and spent $ for fuel pump and etc. Engine light on engine. Engine has to idle for 2 minutes before there is any throttle responce, cold or hot. Performance fluctuates. Fuel filter has been changed. Tranny oil was changed.
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With the check engine light on there should be fault codes stored in the pcm, do you have any idea what they are?
I don't think your problem is releated to the O2 sensors because they are not in control of the system during initial start-up. If your engine is running lean on start-up I would begin by checking fuel pressure and injector flow. Another possibility is a coolant, or air temp sensor that is out of spec but not enough to set a fualt code.
The last tech said it showed lean mixture. They could not tell if it was one of the 4 O2 sensors or a lazy one or what, Their best idea was to start changing parts until something worked. Sounded like a lot of money and practice for the mechanic to change parts. Thank You for your help.
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