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I have read through all five pages of this thread and saw one comment that describes my issue. Three years ago we were buying a new Enclave and retiring our 275,000 mile Express Explorer Conversion to weekend trips. It had been starting and running rough and was overdue for a tune up. With an oil change I replaced air filter, plugs, wires, cap & rotor. Tried for the next four weeks to start it...cranked like stampeding horses, but would not fire. Tried a few more times over months, but in the end it just sat for the next three years. Two weeks ago my 97 Sierra's 350 locked up. Slow charged the battery in the Express. In 20 degree weather I tried it, cranked fine...no fire. Gave it one squirt of starting fluid and it started right up...ran and started fine for about a day, then wouldn't start. Another 1 second burst of starting fluid and ran fine for another day. I changed the fuel filter, but still the same problem. When it runs it runs fine...I was always told that if a fuel pump goes bad... stays bad. After the initial squirt of SF the first time I probably started the van 25 times without a bit of a problem...and it always runs fine after I get it started. For now I carry SF with me...but I am looking for the permanent fix...any help out there?
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