How about a leaking vacuum line....does the vacuum gauge (economy meter) below the speedo move while you are cranking?

I would put on vacuum gauge on the intake manifold...remove one of the small vacuum hoses near the rear of the intake manifold...you may have a cracked hose that's leaking vacuum....

Sometimes the formed hose on the idle air control will be cracked underneath and you can't see it...

Hope this helps,
The Tenor Man