Del Sol Si, Z6 problem..

at first i thought it was limp mode, because at it feels like it stops the spark at 3k in first gear, but the more i drove it and tried different things i'm not sure what it is now.. alright, if i am running 1/4 throttle the car runs fine, idles and starts fine, no CEL..no code, i changed the fuel filter, i tried adjusting the timing, new plugs/wires/cap/rotor but the car still will just lose all power when i'm over 1/4 throttle under load. it revs fine up to redline but as soon as it's under load, anythign over 1/4 throttle just dies, i can cruise just fine down the road at 1/4 throttle all the way to 5th so it runs and drives still.. any thoughts/ideas as to what to try next?

it's a 94 del sol si.. all stock absolutely no mods.

check to see how strong the spark is ? check timnig ? also is it running really rich when you give it more than a 1/4 throttle

i adjusted the timing, changed the cap/rotor/plugs/wires and the spark is good when i crank it to check for spark.. it's odd that the car fires right up no problem, idles high when cold, idles down when it warms up.. runs normally at under 1/4 throttle

could a bad TPS do that?
i'm not sure if it's running rich or not, when i hold it to the floor in first once it hits 3k it starts slowing down, like the ignition was turned off.. then when i let off the gas it backfires once and runs normally.. i'm thinking it's still spraying gas but cutting the spark when i try and accelerate quickly

voltage test the TPS and MAP.