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Originally Posted by Treachery
Now i'm noticing that engine will idle at 850rpm or so... perfect. But after a few minutes, the idle will DROP to around 700-750rpm and begin to sputter as if power was cut in half. I would then have to rev the engine a little to prevent it from sputtering and eventually stalling out.
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As I mentioned, the engine is trying to achieve its programmed idle setting which is 672 in nuetral while sitting still (no vehicle speed). See the attached image for the idle settings. These are just a few of the scalars, there are multiple tables and even more scalars that determine idle quality.
The computer will ALWAYS strive to reach these settings. If these settings don't provide the driveability that you're after, then you need to have a qualified tuner set you up with a custom program that does provide the idle quality, driveability and performance that you want.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"