we had a 92 motor put in our 89 truck and it had 80-90k on it compared to our 270k original motor sometimes, the truck will have to crank over for 3/5 seconds before it starts, when it does start it will act like a carbed motor clearing out from flooding/too much choke... other times, it wont even start, and you have to hold your foot to the floor to get it to light off. black smoke comes out the pipe and it runs rough for a few minutes. does anyone know what is misadjusted or maybe failed ? the iac is new, and tps is also... the injectors are clean, and resealed. pump is new along with the fuel regulator any suggestions are appreciated.