[Diy_efi] My Tach is crazy, Ignition problem.

[Facundo Lozano Ureta]

Hello

I have a toyota Land Cruiser with 2F engine (I6) and I'm installing a 4.3 
Chevy TBI.
My engine run, but my tach is crazy on high RPM (2500 RPM) and some times at 
IDLE, and at the same time my ignition don't fire when the tach is crazy.
My ignition module is new, I use an 1227747 ECM, and a custom chip.  I have 
a GM HEI Dist, and the ignition module is installed outside of the 
distributor.
When I disconect the timing connector, My tach work grat and my ignition 
work witout fails.
any idea?
may be I have problems with my custon chip or my coil?