Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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The P0172 is a bank 1 rich code. I really dont think it is related to your hard start and if we correct the hard start it will likely go away.
Do you have a fuel pressure gauge?
Can you check fuel pressure cold and hot?
How long does it take to bleed off?
No. When it pressurizes before you start it. Watch how long it takes for pressure to reduce.