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Re: tried to start 5.3 definetly no spark at plugs.
Newer PCM's, generally '03 and up are notorious for having a weak tach signal. Go to Radio Shack and get a 680ohm 1/4 watt resistor (they come in a pack of 5 for around a buck) and put one between the power wire and the signal wire to the tach. This will make the signal stronger, but if you haven't already changed it in the tune, you need to change the tach resolution from 6 to 3. Since LS PCM's put out a 4 cylinder tach signal, your tach will only read half of what it should, changing the resolution doubles it.
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