MY 88 Sse is losing power. when I'm drive the car for a while, The car start to do something after it goes higher then 2,000 Rpm. If I push on the gas pedel More. It'* start to Bog down.. But if I still under 2,000Rpm it wil till drive. I only does this when the engine it really warm up on the road. What can it be.. I think it one of the Air sensor.. Can you tell me which one ?

Couple of possibilities to check.

Plugged fuel filter. Allows enough flow for lower RPM'* but starves at higher flows. If it hasn't been changed in a while, change it.

Misfires (plugs, wires, coils, injectors, etc.). Take the car to Autozone and have it scanned for diagnostic trouble codes (DTC'*). Tell us what the results are and we can guide you from there.

Fuel pump. Check fuel pressure at the schraeder valve in the fuel rail.

i change the gas pump. a month ago.. i went autozone and a cord was a cord 64

This thread explains how you can check for diagnostic trouble codes on your car:

https://www.gmforum.com/specifications-general-information-132/obd1-codes-retrieval-gm-1983-95-cars-trucks-%2A%2A-278820/

DTC 64: oxygen sensor right side lean exhaust indicated

Send a PM to BillBoost37 and ask him to look at your thread. Tell him you have DTC64.