5.0 monster computer problems

The tfi was more of a common problem on the 86-93 models because it would develop heat soak issues because of being mounted to the distributor.Once it was relocated to another part of the vehicle,the failure rate went way down.
The ect can be tested by disconnecting its wiring harness and placing multimeter leads across the sensor terminals with the meter set to read ohms.Test it cold then warm the engine up for 10-15 minutes and test it warm.The values should match the chart below for a given temp.

Have you tried pulling codes yet to see if any are present?? All you need is a short piece of wire to make a jumper out of and your mil.The mil will flash the codes (if any)If no codes are present, youll get a code 111 (system passed code) Codes might be present since you're having the type of symptoms you are.In the diagram at the bottom,connect the jumper wire just like shown in the lower left column then turn the key on to activate the code tests.Make sure the engine is at operating temp,the ac is off,the trans is in neutral (5 speed) park (auto) and the clutch pedal is down (if 5 speed) The following link explains where to connect the jumper wire to and how to run the tests.
DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

Do you ever experience any hard starts/long crank times whether the engine is cold or hot?? Do the symptoms occur at any engine temp or only when the engine is hot??