Back fire

[Patrickttype]

My car has a backfire. I can't rev above 2000 rpm. I checked the MAF, changed the crank sensor, knock gauge, ignition coil, ECU, chip, and injectors. I have a Scanmaster and Powerlogger. What I see is wrong is the spark gap, which goes from 25 to 50 degrees. I guess that's my problem, but how can I fix it?

 

[broke]

What’s your fuel pressure doing?

 

[Chuck Leeper]

What I see is wrong is the spark gap, which goes from 25 to 50 degrees.

Huh??
You have a Powerlogger. What are you seeing on a data log?