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Message: <blockquote data-quote="Chris Stephens" data-source="post: 1466474" data-attributes="member: 24095">That’s something I still have in the back of my mind, even though I did check hoses. Possibly a vacuum leak or intake leak. I don't have a vacuum gauge on this car, but the Holley Sniper tracks the MAP readings. According to the Sniper MAP sensor, I have about 5-7" of vacuum at idle (850-900 RPM). Jumps up when you start cruising. The odd thing is, the AFR wasn’t leaned out at cruise like I would expect to see if the vacuum leak was there. And the problem stayed/got worse when I went foot to the floor. With foot to the floor, there isn’t/shouldn’t be any vacuum.  The AFR would peg pretty rich at WOT (I actually thought the bog might be caused by the plugs getting fouled out, but they looked ok other than the cracked one). There is a possibility of the coil not being able to keep up. I do have the Sniper CD box and the Sniper ignition coil. I could swap the old MSD Blaster coil on there and see if anything changes. It always worked fine, I just wanted the full Holley setup. I guess I will go ahead and do leakdown test, just to eliminate any mechanical issues in the shortblock and heads. Then reinstall rockers and set the lash. Test drive it and run some more datalogs to send to the tuning guy. If the problem persists, I'll pull the distributor and physically check the gear. Thanks for the thoughts guys!</blockquote>