Engine pulsing while cruising

[jaxbusa]

I was thinking the same thing too, I'll be replacing one of the rubber gaskets that pull from the valve covers, not sure if that will fix it or not. The only other place i can think of would be the vacuum line that i plugged when I swapped to a hydroboost setup.
I'll see if i can upload a pic of what i was talking about with the fuel banks.

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Did these cars come from the factory with hydroboost?

Interesting...I do have a small leak that I noticed coming from where the pipes from the engine meet further down the exhaust. I only noticed it because water was leaving a trail removing some of the black soot from the exhaust.
Do you think that exhaust cement would be a good thing to plug it with? They're ceramic headers.

You have an exhaust leak that is so big water is leaving a trail of soot around it?

As stated above, if the oxygen sensor is after the leak, your computer is compensating for the false reading.

Fix your exhaust leaks.

Buy a mighty vac vacuum gauge/brake bleeder or equivalent and tell us what the reading is at idle.