[Hypsi87]

Originally Posted by OKC Regal

I am a technician of 28 years with considerable GM experience, and I'll share with you a "layman's terms" approach at finding your intermittent problem. Having read your description of the intermittent problem you're having, although a faulty crank sensor, ign module or fuel pump can cause intermittents, most often when they fail they will let the engine not start long enough for a tech to find the culprit; by your description I would be more suspecting of the ECM (brain), as I have witnessed this type of failure on numerous occasions and each time I was able to duplicate the symptom with a "tap test". Here's the test, however crude it may seem, do it anyway, so here goes. Access the ECM ( I think your model year uses a black ECM with cooling fins on the outside....I don't recall the location of the unit, if I were at my shop right now I'd look it up for you). Remove it without unplugging the wire connectors and start the engine. Tap with one hand on the outside of the unit with a force no larger than a clap of your hands when cheering for the Sooners .If the engine falters at all, have the ECM replaced...can't do it yourself, as the Dealer has to program it with software before it will run. Hope this helps, if not, let me know.

Welcome to the forums. Anyway My GN lately has been running like crap. I tried the cam, crank, sensors and all sorts of other stuff. It turned out to be the computer. The tap test works on mine. I did this a couple of months ago.