The check engine light in my 1998 Tahoe 5.7 liter with 218,000 miles comes on in about 10 minutes showing the code for the O2 sensor detecting too much fuel. All O2 sensors have been replaced, the entire ignition system has been replaced (plugs, wires, cap, rotor, distributor and coil). I am told the spider that delivers fuel from the throttle body to the cylinders probably is cracked and leaking. Anyone done this before? What is involved? - Bob48