Crock Pot

We have a 1990 XLT Lariat with 4.9 EFI and 5-speed. We went thru issues with the temp sensor awhile back and everything was fine after replacing it. Now we have an inconsistent situation where it will be hard to start, and run really rough with no power. It happens after a short stop / shut down at a store or post office and restarted while still hot. Not every time. The exhaust smells very rich while it is chugging. It will idle roughly, but has no power to pull away. Sometimes it will clear itself, and always cranks and runs fine after cooling off. It will have a engine light while it is acting up, but it goes off as soon as the condition clears. I have not checked codes yet, but will they show up once the Check Engine light turns off?
Should I start with a TPS, MAP sensor, O2 sensor or all 3? All new distributor cap, rotor, wires & plugs, so I don't think it is there.

Crock Pot

There are no codes being stored when this condition happens. Idle speed is so low, it won't stay running once warmed up. This makes me think of another potential sensor issue: Intake manifold temp sensor.

Aktech

When the check engine light is on it is usually telling you there are codes. In your other post you said you pulled codes. Hmm, maybe I should go reread the other post.