breaking up from 4,400-4,900!!!

[Bosko5.0]

For some reason My car is breaking up at 4,400-4,900rpm then from 4,900-5,600runs fine. No codes are showing. but seems like it leans out at that rpm.

From a dead stop to WOT the afr drops to 10 but on deceleration the afr goes up to 16.8 then 20 which is lean. Iam stumped


I need my car to be running right since it is my DD.

 

[baglock1]

Had a similar problem a few years ago. Swapped out the plug wires and it disappeared. There was no visible signs of cross-arcing either.

 

[Bosko5.0]

I'll try that. I thought it might be the tps since when I hold the throttle steady the trans clutches will slip like its down shifting.

 

[blksn955.o]

What are you using to get your A/F numbers?

The 94-95 eec runs fairly rich stock at WOT up high. On decel that is normal since there is no load, the A/F goes way lean on decel.

 

[Bosko5.0]

my innovate O2 sensor.