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A quick update. My son and I checked the fuel pressure today. With the vehicle idling, I had a steady 54 psi (60-66 psi normal) and when my son turned the vehicle off, the pressure increased momentarily to 62 psi and then began to fall off ( I believe the bleed off is normal for the 220 throttle...

I have a '96 Tahoe with just over 300,000 miles. Lately, it's been running rich giving P0300, P0172, and P0175 codes. I've checked for vacuum leaks and replaced the MAF sensor and the O2 sensors with no success. I pulled the throttle body off and noticed the inside of the upper intake manifold...