Ok.

In my sl2, I have a fresh rebuild, maybe 3000 miles. Using my WBo2 guage the
car wants to go lean at idle and at cruising throttle. Enough that the car
stumbles when the engine is all warmed up. When you hit the gas at idle speed
the car hesitates before it takes off. Looking at my vacuum gauge, the needle
reads about 21-22 psi vacuum and fluctuated rapidly about 2 psi up and down.
What do you guys think the problem could be?

New -plugs/wires, map sensor, re manufactured head
fuel pressure regulator is set at 44psi
EGR valve is removed and using a block off plate

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Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/saturn/200705/1

Removing the EGR was a mistake. If you are going to modify the engine,
you must also modify the ECU's programming. Exhaust gas is inert, adding
it to the intake charge does not affect the mixture. However, the
addition of exhaust gas will cause the ECU to see an increase in
manifold pressure and normally will inject more fuel if its fuel map
were not programmed for EGR. This is primarily a combination of manifold
pressure & throttle position, though engine RPM and temperature are also
involved. By eliminating the EGR you are now getting more air for the
same manifold pressure than the ECU's fuel mapped is programmed for.
Either reinstall the EGR or get the ECU reprogrammed.

HTH
Gyz

Carjunky via CarKB.com wrote: