Mild miss or studder after 112 fuel

[fleebag]

So I decided to try some racing fuel and bught 112 leaded.
I put in 5 gallons and had about 8 or so already in the tank.
I am getting a weird miss/studder now but not certain if from fuel. It was running rich per PL/SM so I reset the chip and my fuel pressure was at 50psi. so I backed down to 44psi. AFR is somewhat normal at cruise but I can feel it missing. Also, hear a small clicking by the injectors louder than before.

Can the leaded fuel do this? Maybe messed up the o2?

thanks in advance

 

[Major Nutz]

You probably fouled the plugs and maybe the 02 sensor. I did the same thing on 110. It didn't even want to do a burnout but ran great after building boost.

 

[fleebag]

yea i pulled #1 plug but it was ok. going to do a wot run with p-logger and see
thanks

 

[turbofrank]

o2 sensor gone

 

[bose]

I run Sunoco purple all the time and have not had a problem. You only checked one plug, one of the others may be fouled by lead. Bruce

 

[fleebag]

yea i put in new o2 and #3&4 plugs were wet. replaced plugs and drained some gas out and so far so good. think the cruising around town instead of wot made me foul the. thanks