power loss at "WOT" and poor gas mileage

[91nissantwo40sx]

It's been months and i still can't figure out what is causing this problem. The car is a 92 240sx KA24DE N/A. Auto Transmission.

Problem: Power loss at "WOT". Engine works very hard and gets loud but i don't feel the power.
NOTES
* If accelerated slowly the car runs smooth and seems to shift gears fine.
* Seems to idle fine once in a while but when it does act up, it only jumps from 750RPM - 500RPM twice then settles back to idle RPM which is 750RPM.
*Noticed poor gas mileage
*No Engine light signal

Things i have done already:
-New spark plugs
-Ignition wires good
-Rotor Cap looks fine
-Oil looks good
-Cleaned the MAF with a MAF cleaner
-Air Filter's fine
-New Fuel filter
-New oil filter
-Tires are good
-SEAFOAMED half bottle on INTAKE and other half on GAS Tank. Didn't see much improvement.
thats all i can think of right now

I took it in to NISSAN the other day and i had them check for any codes and they said they didn't find any codes. They think that my 'Timing" is a tooth off or something and for the age of the vehicle theres a possibility that it is out of timing. I havn't had the time to check the timing but i am trying other things first until i have the right time.

Do you guys think that Nissan could possibly be right? Any other input on this would be greatly appreciated guys. Thanks

[comatoseculture]

It is possible, but also could the stator not be locking up as well, or am I thinking sideways again?

[240s-sex]

do you have anyguages? something to moniter air fuel ratio, battery voltage or something? cause poor ignition timing or low battery voltage could cause hesitation, more likely your timing tho

[dgms240]

What condition is the transmission in? Could be a worn out torque converter.

[Second Shadow]

when ever I here about anyone running rich, I suggest checking sensor voltages, especially the maf. I'd suggest throttle, temp, and maf as they are easy/free to check. if those check good then look into the timing.

[91nissantwo40sx]

Thanks for the input guys im going to be checking out the timing this Friday and all other things. I'll let you guys know how it goes.

[sx moneypit]

Checked your catalytic converter?