Quote:
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
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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.