280ZXT auto tranny problems?

[tyson]

I have an 81 ZXT with an automatic transmission. Stock boost levels, all new injectors/plugs/wires, exhaust has muffler removed. Runs GREAT, except.

 

My autometer lean/rich gauge is telling me I am running mid-rich at full power. Not way rich, and not lean.

 

When I gun it, I have OK power under 4,000 RPMs, but the instant I hit 4,000 RPMS it is like someone turned on the "more power switch". It is a pretty big change in power.

 

Here is the kicker, I reach full boost of 7.5 psi at around 3,000 RPMs in first gear, so I know it isnt lag.

 

I do notice it in second gear also.

 

Not quite sure about third, it is hard to notice, and I havent had much of a chance to play with it yet.

 

I noticed this kindof after I cut off my muffler, but I am not sure if it was that, or if it happened before or after. I am just noticing it.

 

Could this be an automatic transmission problem, like that it isnt grabbing very well? I have done a couple burnouts and brakestand launches, I have no idea how an automatic works.

 

Any help?

 

Thanks