Hello I'm new here. I recently replaced the head gaskets on my 95 blazer. It ran great before, just using coolant and boiling over. Now it runs at 195. It starts right up, decent idle. You can hear a little miss. As soon as you put a load on it, it misses, and backfires. Almost undriveble. I have a new AC Delco cap and rotor, and plugs. The wires are a couple of years old. I double checked the distributor TDC firing #1. Any help would be awesome

 

Also there are no codes present

 

figured it out. Two bad plugs. Cracks in the porcelian

 

Sometimes a tune up is all that is needed. Glad you found your problem!

 

Totally Appreciate your follow up!
Thx josh8695!