[logician]

So I measured the vacuum, and I find that at 2200RPM, the vacuum on the left side (lower airflow) is 8 inches of Hg, while the vacuum on the right side (higher airflow) is 12 inches. That reduced vacuum is consistant with the reduced airflow on the left side. What that tells me is that the difference in airflow is not a result of anything different in the throttle bodies, but rather due to something different in the engine that causes the left side to suck less than the right side. Strange.

I'm not inclined to think it's due to a blockage in the (stock) exhaust system because it would have to be a huge blockage to affect the flow at idle. The engine seems to run well under load.

I did check the compression a few years ago, and I while I didn't write down the results, I didn't note anything unusual at the time.

Any ideas? Is that difference (33%) in vacuum between the two sides unusual? I still note that the left side is poping during the tuneup procedure, even though that is the richer side.

-Juan