Stumped the mechanic

92GMC

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I had my truck towed to the mechanics after it would not start at work. All it did was turn over without ever coming close to firing up. To put it in the shop for the night they used starter fluid and it started and they put it inside. This morning it fired right up and started every time they wanted it to. The fuel pressure was checked is at 14 psi the fuel filter had been changed four months ago. So the injectors were cleaned and it was ready for me to take home. They cannot test it if it was not having a problem which it did not have at the shop. Has ran great since getting it back but how do I know it will not act up again at any time. Does anyone have an idea?
Thanks,
 
check for corroded ground straps, my 98 did the same thing when you would least expect it, a ground strap was the problem
 


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