Need technical help

[93 TA]

Car: 93 TA LT1.
Symptoms: 100 miles for a tank of gas. Power, not there. Car runs reach as if it was last gas on earth. Distributor, computer, plugs, cat sensors new.
Thanks.

[Injuneer]

You might want to describe any modifications to the engine, since these can affect the performance, and the cure. Have you ever had the engine scanned? Done a data log showing the critical sensors and ECM parameters during road operation?

Appears you may have the classic "false lean" condition, where the ECM thinks you're running lean based on the O2 sensor data (we'll assume that's what you were talking about when you said "cat sensors"). This can be caused by a few different problems, the most frequent of which are exhaust leaks before the O2 sensors, and misfires. Have you checked the plug and coil wires, and the IC Module?

Additional, since your 93 is a "speed-density" setup, it can be forced to run rich by a faulty MAP sensor and/or a faulty IAT sensor. Have you checked both of these? Additionally, if your coolant temp sensor is faulty, and its indicating too low a temperature, it can cause the engine to run too rich.

Have you verified that the Optispark distributor is properly indexed to the splined shaft that drives it off the nose of the cam?