I have a 95' Chevy 6.5 TD. Its kind of hard to start, I have to put my foot on the pedal a little and try and start it. I have to feather it till it will stay running and then its fine, but it has a miss. It smokes a lot when it is first started and until you drive it a ways then it will stop. It drives fine for a little then it will start missing. If you try to get on it a little when you pull out of while you're driving. It hesitates/breaks up and carries on. I'm thinking it might be the optical sensor or PCM that is throwing the timing off etc. Can anyone help me?

 

First thing is to make sure the lift pump is pumping when the engine is running-it is powered by the oil pressure switch in stock form and they fail quite often-AC Delco ONLY for OPS replacement.

Also google "OPS relay mod" for long term reliability.

Also check for trouble codes.
Google OBD1 paperclip code reading.