Cam gudies ??

[jondee86]

If you want to get serious with tuning the cams you will need to check
the duration. If you have 272 duration or higher, you will probably need
to crack the throttle open and idle at 1000 or 1100 rpm. Higher overlap
lowers the manifold vacuum at idle, degrades the MAP signal, and confuses
the ECU.

However, longer duration cams are always going to do their best work at
high rpm, and idle quality is the tradeoff. Quad throttles are said to give
much better idle, but they are almost always installed with an aftermarket
ECU, so not a fair comparison.

Cheers... jondee86