G20 Van with RV Cam no power on acceleration, where to start?

[Raymo86]

Hello, I looking for help on where I should&nbsp; start. I am new to tuning and have burned some Bins with adjusted VE and Spark advance tables, but have not yet been able to resolve the issue. I started with Advance Spark table, but did not get any improvement. Then moved to VE and did see improvement when I leaned them out, but still not where it should be.&nbsp;<br><br>I replaced a 350 motor on a 95 G20 Van, with one that was built for by someone else for a pickup project that fell through. 350 bore .060 over with a RV cam ( I don't know the specs) everything is standard 1995 TBI from the van (intake, exhaust, etc).. it starts and idles ok, but starts to cut out around 1600 RPM, and has very little power when driving.&nbsp;<br><ul><li>Vacuum pressure at idle when warm is 16 Pounds</li><li>Fuel Pressure is 12 PSI</li><li>7427 ECU</li><li>PBSA Bin</li><li>$OD XDF&nbsp;(thanks 93V8S10) and ADX (thanks Mark Eagle)</li></ul><br>Any help is appreciated!!<br><br>