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Re: 97 Blazer with High Idle when MAF unpluged and rough idle when pluged in at startup
Pouring fuel in to get it to start, is a classic symptom of low fuel pressure. Low fuel pressure will also set the P0174, and cause a rough idle.
Key on, engine off, fuel pump running, fuel pressure must be 60psi to 66psi. After the fuel pump shuts off, pressure must remain above 55psi for 3 to 5 minutes. Post your results.
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