Question about 1993 GMC Suburban
I assume it is a 5.7L V8, LO5 RPO. I would start with diagnosis of a misfire, Autozone can do this for free with a scan tool. Second, spark plug wires are notorious for degrading with heat over time--may be a wire. First, get it on a scan tool and see if you can identify the cylinder that is misfiring, and check the wire and or plug in that cylinder. You can always shut the vehicle off and remove one wire at a time, start the vehicle and when you come to the culprit, when the engine will not change its idling characteristics---and you found the cylinder by process of elimination.
Hope this helps
(I am assuming it is in the engine firing with my above statements)
Posted on Oct 04, 2010
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Posted on Jan 02, 2017
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