need help with hesitation

[Supra87T]

My 87 Supra has a hesitation problem between 2500 and 3000 rpm. It goes lean on the wideband (16-18 AFR's) and hesitates/bogs until about 3000 where all is normal again and AFR returns to around 11-10.5 under boost.

-AFM is good
-injectors have nice rhythmic clicking, verified by touching with screwdriver
-fuel pressure is 33 w/ vac 39-49 w/o vac
-plugs are new ngk's gapped to .028, new wires too
-coils are reading 0.00 ohms. tsrm spec says 0.3-0.5

Could coils not firing properly cause it to go lean? Anyone have similar problems or advice on other things to check. I'm running out of ideas.Thanks for any help....

 

[Nick M]

How do you know the airflow meter is good?

Codes will only set when sensor is outside of its working parameters. A flat spot on TPS will also cause a hiccup or flat spot during acceleration. You need a scope to see it though.

 

[Supra87T]

I tested the AFM. I've also tried another one just to be sure. TPS voltage reads pretty steady and it's fairly new also. What kind of scope would I need?

Just for clarification, the car is not throwing any codes.

 

[Nick M]

You need scope with T2-5.

If that doesn't work, get a scope that shows voltage over time.