Hi all, I had a BBK under drive pulley put on when my crank hub was redone, with the correct new belt. Seems like it idles lower when off the gas, like going around corners. Almost seems to stall, but it doesnt, just drops real low idle, then catches itself. Or if I'm going, then comes to red light, I feel like I need to keep foot on gas a little to keep idle up. If I let it just idle, it idles down real low, catches itself, and idles back up....it was the first time I've really driven it in close to 6 months, just curious if the under drive pulley would affect this, or something else, like needing throttle body cleaned....? Thoughts? Thanks in advance

 

your IAC may be sticking

underdrive pulley won't affect idle rpm

 

Then there's the question.... is a gain of 0.7 peak HP worth it?

Drivetrain Modifications #2

 

Just to answer/close this thread, replaced IAC per Chimeras recommendation, clean throttle body, reset battery, fixed issue. Idles fine now. I believe the IAC was the issue, being dirty.