Ok I replaced the 1st piston, rebuilt the head, replaced and checked vacuum lines, replaced iac valve, cleaned and swapped some injectors. I finally got the truck to idle and run but now when I switch gears it gets all jumpy, jerking around, I'm not sure of what to do, any suggestions would greatly be appreciated.

 

Okay to add to that it feels rough when idling.

 

why did you replace the piston? what else did you check or do when you had the engine apart?

 

I broke a connection rod and swapped it out with another 93 , its all in my post, 93 d150 wont stay running.