my ls swap died...

[TooTall]

Originally Posted by truckdude239

so i swaped in a 4.8 4l60e into my 71 its been runnign for a while now and ive been battleing p0171 and p0174 system lean codes, i cleaned the massf low and checked for vacumn leaks but did not find any. drove it codes came back sometimes it would not idle so i replaced the mass flow with an ac delo reman, on my way home ti started bucking and jerking and then stalled out and wouldn;t start back i think i lost the fuel pump in the tank an ac delo ep381 with corvet filter

if you have the orange intake gaskets, replace them. They're known for leaking. Get the green intake gaskets, the GM or Felpro ones will work.