lol..
it's electrical.
unless you think you have some 'drag' somehow somewhere.
it's electrical..
basically not enough ooomph getting' to the right place.. ( or the
return path being weak )
or a faulty new starter.

it's electrical, most likely by far.

try a really fat shot of juice  to the starter trigger terminal via a
Remote Starter Switch ( a tool ) or some other means.

On 4/13/2012 10:49 PM, Ken Olsen wrote:
> I'm getting some good electrical advice, but I did jumper a fresh battery
> directly to the starter. I've also, at this point replaced the starter, so
> I'm ruling out electrical.
>
> I also replaced the bushing.
>
> What else to check?
>
>
>>>> Symptoms:
>>>> Turns over very slowly, sometimes stopping (or catching?)
>>>> Runs fine when started.
>>>> Battery voltage looks good. Jumping doesn't help.
>>>> Voltage at starter matches battery.
>>>> Turns over slowly with:
>>>>     - spark plugs removed.
>>>>     - fresh battery jumpered directly to starter.
>>>>     - WITH NEW STARTER INSTALLED!
>>>>