A lot of good suggestions. When I have a cylinder running hotter than the rest on my drag racing air cooled VW, the first thing I look for is a plugged injector, (this is mechanical injection ala Hilborn, so plugged injectors are much easier to see than electronic injectors). It runs on methanol, and when a hole goes lean, it gets ugly in a hurry.

After that, I'll look for vacuum leaks causing a lean condition. My VW is turbo'd tho and vacuum leaks are rarely an issue, but when it was normally aspirated, it was fairly common. These motors shake as bad as a Harley, so thing work loose, crack, etc.

If it was on my bike, I'd be looking at vacuum leaks, fuel delivery, blocked cooling air.

 

Thanks for the helpful input.

Am ordering a fuel tank crossover line quick disconnect and when that arrives I'll be doing compression test, leak-down test, injector swap front-to rear, vacuum leak test, MAP sensor, IAC, TPS, air temp sensor, and baro sensor test just to eliminate the things within my control. I'll also be installing a data logging system incl wide band o2 sensors and dual gauge *if* I the system is capable of logging TP in addition to AFR and RPM. If I cant find a system capable of that, then I'll just bite the bullet and buy a thundermax.

 

This is the one I was thinking of getting, does what you want.
https://www.rbracing-rsr.com/lsr21.htm#o2port

Look under o2 port tab

 

Z, what are you using for fuel?

10% ethanol?

More than 10%?

It needs to be fatter than running 100% gasoline.

Find a tuner in your area that knows power commanders, AND uses a dyno.

 

Whatever is in California Chevron 91 octane. CA does not mandate ethanol in their fuel, but if memory serves, this fuel is up to 10% ethanol.

Already been down the dyno tune route.