Hey all, has anyone ever had any issues with the spider injection system on our 4.3's? Ive been noticing lately that I've had a loss of power at speed. Meaning off the line I still have good torque and some power, but say going from like 50-80 it stumbles. It gets there eventually, but it just seems like its lost its 'umph!' Now keep in mind, its got close to 187k on the odo, but ive done everything on maintenance on this truck thus far (all filters, minus fuel pump) and even ran a can of seafoam through it, and I still cant seem to figure out what the bog down could be. Any ideas on where else I should look? Also, i've been getting a Lean system bank 1 & 2 codes lately, originally it was just a leak bank 1, now it is both. o2 sensors?

 

i would test the fuel pressure almost sounds like its time for a new pump

 

Seeing that the issue is at higher speeds, thats the first thing to come to mind for me too.