I had similar issues with a Howell setup on my old F150 (300 I6). I determined that it was starving for fuel when you accelerated. I put a gopro under the hood with the air cleaner off so I could watch what it was doing. Mine turned out to just be a dirty fuel filter. I also routed the fuel line in the engine compartment to run down into another fuel filter just before the TB. It acts as a little reservoir and keeps it from starving.
Another helpful tool is to get an ALDL cable and use something like TunerPro RT.
Another helpful tool is to get an ALDL cable and use something like TunerPro RT.
