89 chevy k1500 weak spark. Changed ICM and distributor cap. still weak spark. Pickup coil tests at 850 ohms so I'm pretty sure that is good. Any ideas?
whats the voltage in and out of coils
Coil may be weak, it can be tested at Auto Zone, and replace the rotor, they get a burn threw to ground. Just look underneath the rotor to see a burnt spot in the center.