I have a 1989 f150 6 cylinder with a standard transmission.
Upon acceleration the engine bucks and was doing better when I would either rev the engine and let the clutch engage slowly. I replaced the throttle position sensor and there was partial relief but now it went back to its old ways. And the engine sometimes will not even rev up starting from a light for a period (few seconds) and again I must rev it up a lot and then let the clutch engage which also results in burning the clutch.
For a while after replacing the TPS, it was better but it always bucked when it was cold and during acceleration but now it I give it full throttle it buck like a mechanical bull in a bar.

also, does this model have one of those fault or code reader? If there is, can you tell me which one I need to get?

 

I don't know where you are located but around here, all the auto parts stores will check for codes free of charge.

 

That's normally only OBD2, which didn't come till 1996. Here is how to retrieve codes from the old EEC system:

https://www.scribd.com/doc/34996350/...-and-Procedure

 

Check your fuel pressure - with a gauge,