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bank 1 lean on vortec 4.3?


boostedgtp

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I have a 2000 blazer with the 4.3 and it has a code for bank 1 too lean. I have sprayed the top of the motor with starting fluid and found no vac leaks. All 3 O2 sensors appear to be working as does the Maf. No exhaust leaks. The truck has +25 LTFT for B1 and +18 LTFT for B2 while driving. Could there be a vac leak under the cover for the "spider injection"?
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I check fuel pressure last week and it was in spec ( dont remember what is was). I havent done a volume test. Yeah for some reason it only sets the right bank code. The truck has never got plugs or wires or a fuel filter. I was looking a live data and saw no misfires. Im going to get a fuel filter for it this weekend but I was talking to a chevy tech and he said GM has a gasket kit with a new cover piece for the fuel injectors that can leak vacume but I used a can of starting fluid on it with no signs.
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