Big RPM drop when going from Park to Drive

[K5_Fla]

Yep... good old ported and manifold debate... it's been around longer than anything. BTW, based on everything I have read on the topic (a lot) Folken is exactly right. I run manifold as well. great article below .....

http://www.corvetteactioncenter.com...rformance/38790-timed-vs-manifold-vacuum.html

 

[Deuling]

Heres one I started a while back. Its got some good info

http://coloradok5.com/forums/showthread.php?t=281270

 

[goathearder]

Ok, since manifold vacuum seems to be the way to go, I hooked up to manifold vacuum, dropped the park rpm to 750, retuned the carb (it was a bit too lean) and after a few iterations of idle speed and mixture settings I am basically where I was with ported vacuum. Park idle around 750, drive idle around 500. Good throttle response and acelleration but nothing better than when I had it at ported vacuum. The idle does seem to be a tad bit smoother and more consistent though and since everyone says mani vacuum, I'll go ahead and leave it there.

I must say, I love all the knowledge this forum brings out.

Thanks for all the help!