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Re: 91 GMC K1500 Won't Start
You say you have good blue spark and 91 is probibly TBI so easy to introduce fuel, with spark and fuel and simple 1st gen ecm you should have some reaction so I figure wrong timing. put timing light on #1 wire aim light at marked crank turn over (it will still show if you indeed as you say have spark) see if its even close I would bet its not I could be wrong but I dont think so. If it is off it may be gear on distb (I believe it has dist) or timing chain. Good Luck
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