We've had a lot of problems show up here from TBIchips.com with same issues. 16* at idle seems to be the only thing he knows. Also in another thread the guy was so desperate to make his engine run he kept adding timing till his base distributor was at 11 degrees and it ran great. When he confronted the TBIchips.com his answer was "I've always had good luck with TBI timing tables in Vortec head engines!"
Here's how he gets the fueling dialed in...
http://www.gearhead-efi.com/Fuel-Inj...LMs-every-time!
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