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Hello All, Up until about two months ago my old girl was running great. She has 70k on the ODO, no mods, serviced regularly and has been a fun car until now. The problem happens when she is at operating temperature. Under medium to full throttle she acts like she is fighting a drag chute. Engine tries to rev and she tries to accelerate, but it happens slowly. Like something is holding her back. I have no DTC's or check engine light. The problem occurred about 30 miles into a full tank of gas. I have since tried several tanks of premium fuel to no avail. I have tried fuel injector/system cleaner to no avail. The thing is, when she is cold she runs normal. Accelerates like a bullet. BUT, once at full operating temp the problem crops up. So that makes me think it is not a mechanical problem like a turbo-catalytic converter-torque converter-transmission or PTU. Do these things still do the old school open loop/closed loop oxygen sensor thing? If so could this be a pending O2 sensor failing? I only have a basic code reader so I do not have any further diagnostic data. Thanks, B.