PUZZLER!!! My new motors a dog! what did I miss?

I had Midas phone and ask if I could do a timing chain on a truck they were working on.. Long story short... Truck came in on hook,, I checked the T/chain with the split overlap at TDC method, and it was good,, so phoned and asked what was going on.. they said they put exhaust on it, it died half way across their lot.. We checked for spark etc,, then I had one of my guys crawl under and sawsall off the muffler,, got in ,, turned key,, and drove it back to Midas, told 'em it needed another muffler that wasn't plugged..

At post 37 I mentioned unhooking headers,, cuz it was all new (unknown)exhaust ,, so when you get it running, please consider seeing if exhaust is coming out both pipes,, and have someone stand behind while revving,, scrutinizing exhaust flow.. consider a run with open headers,, jmo

hope it helps,, "puzzler's" right