Need ideas

[427dart]

Ok guys im looking for a little advice or for someone to give me a idea of were to start.

07 Procharged.

On friday we had the car on the dyno all day. The tune came out great everything looks good except for one issue. There is a stumble right at 3000 rpms, just a split second stumble and everything goes back to normal. Everything looked good on the log except for someone reason it would pull fuel at 3000 then snap right back to normal. No matter what was done with the tune there was no change.

Could this be TPS, TB, MAF?

Thanks in adavnce.

 

[Miracle]

Do you have a .jpg copy of the dyno run? Did you get an AFR reading as well? Was it affected?

Sounds like it could be pulling timing or fuel for some reason... only way to know is either datalog or check out the dyno graphs AFR curve.

 

[GrnBullitt08]

Do you have a .jpg copy of the dyno run? Did you get an AFR reading as well? Was it affected?

Sounds like it could be pulling timing or fuel for some reason... only way to know is either datalog or check out the dyno graphs AFR curve.

+1....post the graphs

 

[427dart]

No i dont have the log.

The tuner said it was pulling fuel when he logged it but no matter what changes he made it would change. He said it had to be mechanical.