Timing/running of my 97 GMC Yukon 4x4 -5.7 vortex
Truck has been running poorly for some
time , sometimes better than others .
Recently it just quit while driving , still rolling
I put it in N and tried starting it . Backfired so
I coasted to a parking lot , towed to a shop .
Replaced timing gears and chain,water
pump, messed up oil pan gasket so pulled
pan , replaced oil pump while pan was off .
All back together turned key and shredded
muffler . Checked ,position of #1 it's correct
. Where do I look or start , I'm baffled
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