pls help a troubled mechanic ...1988 chevy c1500 4.3L TBI automatic. "Truck has been sitting for 3 years ran good when it was parked and now not so much ..." so we hear from the customer. after another shop has put on a fuel pump/sending unit and new fuel filter, they decide its a transmission problem . trany shop rebuilts transsmission . then yet another shop replaces the ECM, intake gaskets, rebuilds TBI, ignition module, and pick up coil, cap, rotor, wires, plugs, etc etc etc.now I get it . this guy is pissed off and is real leary of getting yet another wrong diagnosis..and i am at a loss. the truck smells rich and runs lean. fuel pressure is 15 psi..(2 psi higher than spec)and on a tbi it is sapost to be a constant pressure .(from what i understand)so ya that exsplains the smells rich. but at 1/4 to 1/3 throttle under load it starves for gas and runs bud. i can clamp off the return line to the tank at a rubber junction and the truck runs out GREAT.. but still smell rich .
