Low engine vacuum will cause a vacuum modulator to sense a load condition when it's actually not present.I say this because you have to keep your foot on the gas pedal to keep the engine running.
You can start checking at the line or hose to the modulator between the throttle body and the modulator with a vacuum gauge.
The modulator should be receiving engine manifold vacuum. If it does there are no vacuum leaks in the line to the modulator.
Check the modulator itself for leaks with a hand held vacuum. The modukator should be able to hold about 18 in. Hg.
Check the modulator for ajustement.
If the modulator is low, check the engine vacuum
a coomon problem foee low vacuum is a restrited exhaust'
Saturday, December 9th, 2006 AT 9:47 PM